But Disco's versions of the characters are unique. When the Spock/Sarek rift was created, there was never any intent of a secret sister being the root cause. It's stuff added into a heavily rewritten version of the continuity half a century later by other people.Yes, and it should.
I am at a loss at all the "no" comments. DISCO has revealed background on Sarek, Amanda, and Spock. What we see of these 3 should have an impact on scenes in TOS. We should be gaining insights on the relationship between Spock and his parents.
Someone already mentioned Spock's decision to join Starfleet instead of the Vulcan Science Academy. For 50 years we only had TOS to inform on Sarek's reaction. Once we found out Sarek made a deal for Burnham to join Starfleet and Spock to join the Science Academy, that should have put Sarek's TOS scenes in a different light. Likewise, the revealing of the closeness between Burnham and Sarek should cause us to reassess everything we thought we knew about Spock and Sarek's distance.
Yes technically it's the same continuity because CBS own it and say so, but really it's like saying Bruce Wayne's backstory in Gotham affects the old Adam West Batman series in any way.