I don't think that was sarcasm, Chris Sawyer wrote most (all?) of his games in pure assembly since the 80ies. The outworldly quality of this feat is legendary. TTD, and also RCT and RCT 2 were incredibly stable games. I played them for months and months as a kid, and never encountered a crash.

I don't read it as sarcasm, but more as a genuine achievement

Thank you

This is meant as a compliment. The lower level the language, the easier is to make a mistake in it, leading to instability. The stability of the product, then, is a testament to the ability of its creator.

Chris have indeed written the game in Assembly, however, this is just one aspect of the truth. He actually used a kind of higher level generator or macro system for the game. But, still assembly, at the end of the day. Just not written by hand in Notepad, like how CS students do in class. Or was that just me?

Frankly, if two different people had written two similar games, and one had chosen assembler and the other python, I would assume the assembler game to have fewer bugs simply because the much higher skill level.

I program in Python.