If you're _just_ overclocking, then I think that's safe to say. However, the OP was referring to things like installing new thermal pads and installing hardware mods. That sounds meaningfully more risky to the lifetime of your card :)
Admittedly I haven't tried anything newer than a GTX 1070, but on most cards you can softmod or hardmod the voltage to dangerous levels, enough to burn some VRM components or the GPU itself. It's quite fun :D
