Frankly, you’re the one exaggerating. The above poster is discussing “high quality” apartments. 300k will get you 250 sqft or freshly plastered bullet holes.
Two seconds on Zillow you can see tons of properties for $300k that are neither 250sf or plastered with bullet holes.
One of many examples:
https://www.zillow.com/homedetails/205-E-63rd-St-APT-10H-New...