[ultima ratio]

<> Doesn't the SSPX tell their supporters that attending the Missa Normativa does not satisfy the Sunday requirement?<>

Yup. On absolutely solid theological and moral grounds. The Society follows Trent, not Bugnini.

[Tantumergo]

"<> Doesn't the SSPX tell their supporters that attending the Missa Normativa does not satisfy the Sunday requirement?<>

Yup."

Then how does this square with the SSPX's claim that they do not question the validity of the Missa Normativa?

If it is valid and offered licitly then it must satisfy the Sunday obligation.

If you claim that it is not valid per se, then how can you claim that you are still in communion with the very Pope who promotes it, and celebrates it.

Surely to deny the validity of the rite is to deny communion with the Pope who celebrates it and the only logical outcome of the SSPX's position is to claim that the present pontiff is not really Pope at all?

Sedevacantism or schism are the only logical outcomes of denying the validity of the Missa Normativa.