Worth noting that only the first two points there are relevant here, since these are not single file libraries. Also, the STB libraries work massively differently from C++ header only libs (#define STB_FOO_IMPLEMENTATION, for example).

Also, fwiw Sean Barrett also has gone on record as saying that he's not really a fan of C++ before. I'm struggling to find a specific link, but it's not really a secret.

(As a side note, to anybody who is in the need for what they do, the STB libraries are really absurdly high quality and can do exactly what you want them to 99% of the time. Highly recommend!!)