Do you have a source for the Gulfstream type rating cost? Most type ratings cost around $10-15k, and the most expensive I’ve seen is around $35k. Very few pilots pay out of pocket for type ratings, but the vast majority who do only need to take a low 5-figure hit. An aspiring airline pilot could self-fund all the formal training they ever need for under $100k.
$100k is probably from zero to Gulfstream-rated ATP, not including opportunity cost. But yeah $100k for a single type rating is unlikely to say the least.
