Red Guardian DID fight OUR Cap in the 80's...

Just discovered this subreddit, I have a ton of theories actually but my very favorite -

We see Alexi in prison sharing his story about besting Captain America in a fight in the late 80's, and another inmate seizes the opportunity to embarrass him by reminding everyone that Steve Rogers was still frozen in the ice. That was true, but-

After the events of Endgame we see Steve as an old man at the end of a long life, which we learn was shared with Peggy on our timeline.

So-

We're to believe that the director of SHIELD secretly had a super soldier sharing her bed at home and didn't on occasion ask Steve to intervene in secret or that Steve never felt obligated to intervene because he had to help Peggy?

Of course he would have operated as a complete spy and done everything in his power to ensure that nobody knew it was him- ESPECIALLY the U.S. government/SHIELD with the concern of changing the timeline too much if he was revealed...

Then- consider that Alexi would have been in his absolute prime while Cap would actually have been 30-40 years older than we saw him last. In super soldier years, that makes him strong enough to keep fighting but much easier to break down... when Alexi runs into Natasha he can't wait to ask him if Steve told her stories about him; does a man who just had to take that embarrassment an hour ago, risk that embarrassment with his "daughter" who he clearly regards as one of Steve's closest friends and had defected to SHIELD before Steve was recovered from the ice- Alexi believes he fought Steve and believed he had finally found a person who would give him the respect and validation and it's dismissed. He probably hoped Natasha could even explain the ice and his embarrassment.

He fought super secret black ops Steve Rogers to keep the world safe for all of us and only Peggy knew. SHIELD's best kept secret of all, and only the Red Room and Hydra believed the possibility but dismissed them as quickly the way the Winter Soldier was a ghost to the world's intelligence agencies so long. Steve took a page from Hydra's book, but he was just twenty years past his prime and fighting in the shadows. AND Alexi WAS his contemporary.

Respect, Red Guardian 💪

P.S. if everybody has this theory, I'm new here, and if nobody has this theory and Kevin if you're reading, this took me two minutes and I'll write you three films let's talk

Edit - will put this in comments too, but there's supporting evidence, or enough of it. To everyone insisting that he was on a branched timeline- if that was the case, the only way he could have returned to our timeline was with Stark's time/space GPS. His return coordinates didn't return him to the pad as Banner and company planned, and Banner even points out, Steve didn't return using the device. We also learn in Loki that Sylvie has been hiding in apocalypse events because no matter how big her actions are, they don't have a big enough impact to branch the timeline. Steve spent Endgame knowing the importance of not tampering with space and time outside this carefully laid plan, and after giving back life to half of existence I find it hard to believe that if he decided to stay at all, that he wouldn't find a way to keep his actions and their consequences small. If this is true, it makes perfect sense that Steve is already present and waiting. He didn't walk up and surprise them just before the jump, he made his last patient act and knew from that moment, he was safe to reveal himself. We learn from the TVA that our "sacred timeline" that is 616, is SUPPOSED to have the Avengers traveling time and making changes and it's a part of our own timeline's continuity and must happen- but Cap hiding out and pulling black ops while in his retirement years isn't plausible?