OK, that's wrong. Not in an "I have an opinion, you have an opinion" sort of way. It's objectively wrong in a way that a statistics professor would mark your answer incorrect on an exam sort of way. We're gonna have to go back into some academic-level statistics to explain why.
A true-talent 78 win team will expect to win 48.1% of their games. But even if God Himself tells you that the team's true talent level is 78 wins, they won't win exactly 78 games every season. Or even most seasons. That's not how probability works. In mathematical terms, their observed win percentage will trend toward their true win percentage as the number of games stretches forward toward infinity, but that doesn't mean it will hit that line at exactly 162 game.
This is the same thing as God Himself telling you that a coin is a true 50/50 coin, but you will still frequently get 6 heads and 4 tails in any 10 flips. The observed rate will trend toward 50/50 as you approach infinite flips, but it will frequently diverge from 50/50 for long stretches. Those divergences are what we call "variance." Expected variance approaches the limit of 0 as iterations approaches infinity, but it never touches zero because iterations are never infinite.
If you flip a 50/50 coin 162 times, you expect to get 81 heads and 81 tails, but it's extremely probable that you will observe variance. If you start out with 10 heads and 6 tails, then in order to get to 71-81, you'd have to 71-75. If you *expect* that to happen, that means you're expecting the properties of the iniminate coin to somehow have knowledge of how the past flips have gone and adjust physics so that the coin is no longer 50/50. Coins do not have knowledge and cannot change the laws of physics, so this cannot be true.
Expecting probability going forward to change in order to revert observed variance is a human cognitive bias known as "gambler's fallacy." Our brains are sometimes wired to think that way, but it's wrong.
If God Himself tells you that a team has a true-talent level of 78 wins and they start out 10-6, absent any other information, the correct answer to how many games they are now expected to win is (rounded off) 80.
None of this has anything to do with your original argument, which was about strength of schedule, so I *think* this might be one of those situations where I'm not supposed to be taking your answers literally but generally you're just expressing the vibe that you think I'm wrong and the actual arguments you use aren't supposed to matter.