The problem with the definition isnt that its inaccurate per se irs more so that tankies have kinda realized on some level that they get derided for it so they cover it in like 5 layers of obfuscation. Combine that with folks doing it ironically and ya get a 4chan situation where ya cant tell whos serious and whos not.
Also doesnt help that some of them are legit just anti-american and just dont think about anything outside of North America. Theyre a diverse group and the term Tankie was xreated long enough ago that its sorta becomes inaccurate with the edge cases.