Seems likely. All but one of the comments I saw was from at least 2 years ago.

@Treebark said:

Hokum?

Season 13

I read somwhere that CBS was going to go ahead with two more seasons before Jim Parsons announced his leaving

The reason I did some looking was that there was also an article about this on my Google newsfeed about 2 days ago. Probably isn't true.