The funny thing is that the guy trying to find inaccurate moves in my games around move 17 with the help of an engine while himself he doesn't even understand what are the very main ideas of the Catalan.
QC2 is a common line and you played the books moves, great job!
You ever heard of the Sicilian? You played the Reversed Grand Prix, any experienced Sicilian player understands the move d5, or in Reversed colors = d4.
Go ahead and praise yourself but this is not anything impressive. You miss the obvious nuances, hence your your Catalan and Engish is junk.
Checked your draw against an 1800. That guy didn't seem to care at all tbh.
You didn't blunder, but you didn't play good positional chess either