Usually, that refers to the time just as the summer break hits, where all action has a mandated 2 week pause. During that time, teams usually announce any new driver signings or firing. Some years are more hectic than others, as the entire team structure can change dramatically for the next season, while some drivers are essentially driving a 'lame duck' second half of the season.

This year had some interesting moves. Alonso jumping ship to Aston Martin. Gasley leaving for Alpine for an all French lineup. Alpine losing two of their drivers in less than a week (and the gaffe they made announcing Piastri after he was signed to McLaren). Danny Ricc getting dropped and having to grovel back to Red Bull as a reserve driver (and now Perez looking over his shoulder). The return of the Hulk. The first American F1 driver in ages. If you follow F1, there were a lot of pieces moving this year, much of it set off by Vettel retiring (godpseed to him too).

It's not as reality TV dramatized as DTS makes out, not by a longshot. But watch F1 long enough and you'll see the drama for what it is