He's not wrong. This is anecdotal, but the amount of non-contact muscle and ligament injuries I've seen in the past year to players that don't get a break on international duty seems genuinely unprecedented.
Nation's League needs to go. There's no need to have competitive international matches outside of WC/Continental Cups and qualifying.
No one actually gives a shit about Nation's League, but the international managers have to play their best squad available to pad their record and keep their job. Fewer competitive international matches would be better for everyone involved. Let some youngsters get a cap in a meaningless friendly and acjieve their dream of representing their country, and give the world class internationals a damn rest!