He’s already down for FP1 at Texas. They must be taking him very seriously to give him this run out.
Superlicence points might be an issue though.
https://f1.fandom.com/wiki/FIA_Super_Licence has a table for points given. Also,
Drivers may also earn points for:
- 1 point – Driving at least 100 km during a Free Practice session for up to 10 points.
- 2 points – Completing an FIA Championship with a penalty points system without receiving any penalty points.
- 5 points – Winning the Macau Grand Prix
Via his 5th (2021), 3rd (2020) and 7th-place (2019) IndyCar championship finishes, Herta sits at 32 Super License points. Without any practice or testing points, he would gain the ability to apply for a Super License at the end of the 2022 IndyCar season, should he finish 3rd or better in the championship, which would give him 48 points.
Except he’s currently in 10th and realistically has no chance to win or get third unless something truly miraculous happens. So even if McLaren did want him to replace Ricciardo he can’t.