I would like you to explain how "You better not do some type of async stuff in LINQ, because the system is going to spawn a process for each entry, obliterating

I would like you to explain how "You better not do some type of async stuff in LINQ, because the system is going to spawn a process for each entry, obliterating your production instance by creating thousands of processes, using a bunch of MB for each process." translates into how using async spawns processes. Not tasks, not threads, but processes.