He (and all other) has only 8 of those tyres. So I´m pretty sure that he was not using those.
Check Bulletin4. It says max number of Sottozero is 8.
Printable View
https://www.ewrc.cz/images/2020/phot...r_dsc_3839.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3610.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3639.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3286.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3910.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3922.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3961.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3030.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3949.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3987.jpg
https://www.ewrc.cz/images/2020/phot...r_dsc_3906.jpg
more
https://www.ewrc.cz/foto/66881-aci-r...onza-2020/515/
Even "worse" : Inthese days drivers did not compete on equal footing as some entered more events than others, and some events were poorerly supported and by just finishing you were guaranteed a top 3 finish. This did not make the likes of Biasion, Sainz etc... less worthy champions ....