I didn't hear that either. No Republican has said he/she would vote against. You can bet that if that happened, the news media would report it. They're itiching for an excuse to paint Alito as "extreme". Respectfully, I think the person who posted that is mistaken
I think the strategy is to try and put future R presidents on notice that they better have the numbers, because conservatives will not get their votes, regardless of their qualifications.