I'm not sure what you're confused by. Read the post that I was responding to (and the posts that they were responding to) for context.
Right, that's the budget of a game. No single game is going to move the needle in bringing PlayStation users over to Xbox. $100 million won't drastically impact PlayStation or Xbox, because you're only getting one AAA game out of that. Why would someone move from PlayStation to Xbox over Tomb Raider?
Microsoft has the funds to be able to be a loss leader in exclusivity deals for many years in order to convince players to switch from PlayStation to Xbox. They could have sunk a tiny fraction of the $69 billion they spent on Activision Blizzard King into exclusivity deals over the next 5 years. If $10 billion in exclusivity deals over the course of this console generation wouldn't pull people from PlayStation to Xbox and give them a leg up on Sony, then Microsoft would need to re-evaluate if they want to be in the hardware business at all at that point.
Instead of taking this route (which is the same route they took with Game Pass, mind you) they decided to buy the largest third-party publisher in the world. A third-party publisher that has a greater market share than Nintendo, and has over half the market share of the market leader, Sony. This is a ridiculous move, and it was 100% not necessary in order to catch up to Sony/PlayStation. The issue is that Microsoft went for the quick and easy build-up instead of investing in the games.
I hate exclusivity agreements across the board, but Microsoft's way of permanently making a publisher exclusive (because it will primarily be exclusive content, regardless of whether Call of Duty remains multiplatform or not) is way worse than the timed exclusivity deals that Sony engages in (and which Microsoft chose not to invest in).