From the article, it seems they using a clause allowing them to terminate the contract after transfer of ownership.

This clause probably has a expiry date and they are saying “we are trying not to be jerks here by waiting until the last second to trigger it”.

It makes no sense that a contract would even provide a maximum notice period. Why would parties put that in? What benefit would either derive from restricting themselves to not getting earlier notice.

I read it as: we acted as quickly as we could once it became possible to do so, i.e., the change in control was completed. not that their special agreement carved out some maximum notice term.

3 months is a long time in AI world