Has something changed? That seems to be the same page they've had for a couple of months. It's only for deep research mode, and is restricted to Pro and Enterprise.
Eg how I described here a while ago: https://x.com/wunderwuzzi23/status/1930899939737166075?s=46&...
Ironically, I have a blog post drafted that explains this also in detail, and should probably still publish it.
It’s disappointing they are gating this and browser agent for $100 users, and even for 100, it’s only two tool methods.