Yes it is still true, they just have decided to support newer c standards when they sabotaged c11 by making optional a fundamental feature like complex numbers:
> Support for Complex numbers is currently not planned and their absence is enforced with the proper feature test macros.
Sadly, there is no future for the C language with a corporation like them in the committee. Much better to look at Zig or Nim, they fill more or less the same space and are developed by smart and passionate people.
> A compiler that defines __STDC_IEC_559_COMPLEX__ is recommended, but not required to support imaginary numbers. POSIX recommends checking if the macro _Imaginary_I is defined to identify imaginary number support.
They have not sabotaged anything when the feature is optional to start with.
If ISO wanted everyone to actually support it, it wouldn't be optional.
> Support for Complex numbers is currently not planned and their absence is enforced with the proper feature test macros.
Sadly, there is no future for the C language with a corporation like them in the committee. Much better to look at Zig or Nim, they fill more or less the same space and are developed by smart and passionate people.