Yes, there are more candidates to choose from today than 5 years ago, but that just leaves more candidates. The hiring bar is higher, but the proportion of good Americans doesn't get higher.
Sure you can get a better American today than 2019, but you're comparing any one candidate to their competition and the company bar. If you want to deliberately hire Americans who interview worse than non Americans, you're breaking the law
You mean to say you get a large amount of high quality American candidates?