mm43
we had this discussion in thread 3 ages ago. I think it was TAKATA who explained it there.
The stopping of the THS trim is a function of the static longitudonal stability protection and is only available in Alt1, not available in ALT2.
In certain failures like 2 ADR which was the case with AF447, the longitudonal static stability cannot be restored, which means imho that THS trim remains available.
I would be cautious with the reference anyway, the instructor support manual is from 2001 and has been replaced by the FCTM some years ago. In the FCTM the wording is similar, but the part with the trim is missing. That is for the A320 as well as the A330 /340 family.
Also the Technical Training manual states, that in ALT2 only Load factor protection would be available.