This is very demonstrably false, both theoretically and in the real world. Ranked choice voting only solves the spoiler effect in cases where the spoiler candidate has a small enough amount of support as to be rendered non-competitive, but if you have more than two candidates who are competitive then the spoiler effect comes back in full force. This is not just theoretical; it happened in the Burlington 2009 mayoral election, and fallout from that election led to ranked choice being repealed shortly afterward.
So, not only does ranked choice still incentive strategic voting sometimes, but it does it in a way that is harder to see and understand. There are other non-ranked voting systems like approval voting and score voting that are much simpler and better in this respect.
Ranked choice also has other drawbacks - like violating the monotonicity criterion - as well as more practical issues like making it impossible to distribute the counting process across precincts.
No there are no real valid arguments against ranked choice voting.
This is also quite incorrect. Our current system of first-past-the-post is bad, yeah, but there are plenty of valid arguments against ranked choice and - in my opinion - there are much better systems we could choose instead.