Ummm no.
Like in 1984, when they built the aquatic center, it was on the UCLA campus (perhaps it was USC). The pool was used by the UCLA swim team for decades (and is still being used I believe).
The velodrome that was built in 1982 for the Games was used until 2003. It was demolished and upgraded and will be used in 2028. In non-olympic years (and probably during it), it’s hosted training, NCAA competitions championships, World championships, etc...
I don’t know if you’re being moronic on purpose or not but this is what I mean by existing infrastructure; its used after the Games. You build that same velodrome in Qatar, you don’t end up getting the NCAA championships, because muslim nations don’t have a large female contingent (if any) in their colleges, you get smaller events. So that would be an example of what the IOC should view with a jaundiced eye. Hence my repeated discussion of sustainability.
As for the upkeep between the games, If UCLA/USC doesn’t need a new aquatic center, for example--I’m not sure if they are building one or not--one doesn’t get built. Perhaps Pepperdine or UCSB need one? The Softball diamond in the OP, for example, is up and running in OKC. IT won’t be built and will be used well before and well after the games.
Umm...you’re not thinking.