The source the Tweektown article is quoting also says:

Anticipation is so high that some competing game publishers are waiting as long as possible to commit to their release dates for the fall, according to people familiar with their deliberations who asked not to be identified because they weren’t authorized to speak publicly. The publishers want to see whether GTA 6 will make its deadline or slip into 2026, these people say, and they’re determined to keep their own games far, far away.

bloomberg.com/…/-gta-6-release-date-will-decide-m…

This is probably more interesting, that some upcoming games which don’t have release dates may be waiting for this before they commit to a schedule is somewhat noteworthy.