“This guy” doesn’t believe compiler technology has anything to do with font rendering. You’re misrepresenting his view. He’s complaining about how Swing prevents him from disabling font hinting. Swing is part of the *platform* that he criticizes. He’s not talking about compilers, at all.
The idea here is that a proper native toolchain would also extend to support OS-native UI-toolkits (and therefore native font rendering), because people would need an alternative for Swing.