The guy who actually work in baseball as an actual trainer feels he has 80 to 100 innings in him tops this year, so no it isn't "flabbergasting" to think this. In fact your completely unsupported and un proven opinion is the one that qualifies as "flabbergasting".
Give me one example like Garrett Crochet in baseball going from 30 innings a year on average for the years before their surgery to a full starter work load.