For practical reasons, however, we call attempted extermination genocide, which I think confuses people. (It also brings up all the mens rea problems that plague any prosecution of attempted and ongoing crimes.)
I wouldn’t conclude someone is a denialist or racist or hate speaker just because they hesitate to call something a genocide. (I genuinely don’t know what that word means anymore apart from throwing up my hands and saying it’s whatever a clique of humanitarian organizations say it means.)