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While the new Tiamat would let Nasus get multiple Q procs, it also comes with downsides.
It delays CDR which costs him Q procs, it can't be bought early because he has to build tanky to lane, and it requires quite a lot of set up in lane so most players won't be able to make much use of it.
It also doesn't solve his real problems. He's still trivially easy to kite and has his only form of pseudo-CC gets doubly reduced by tenacity.