None of those Democrats ever at any point suggested that a SCOTUS nominee shouldn’t even get a hearing.
No hearings is a means play, not and end play. There were many means for Chuck Schumer to enforce the Schumer rule. Hearings are historically not necessary or proper for a nominee and are a recent phenomenon.
For example, he could have deployed his media to use Maxine Waters style tactics to intimidate, harass, and threaten the nominee and his/her families.
Alternatively, the Schumer rule could have been enforced by simply dissolving the vacant seat on the Supreme Court and reviving it on January 20, 2009. That is what the Democrats did to a seat on the DC circuit because they didn't like then current President.