That statement came from a A320 LVO CBT . It was produced by my former employer. Since posting this query I realized that the statement is wrong but I’m not going to bother contacting them to change it. In actuality the freezing of the capability for the 320 family is 100ft. The statement is found in the new Airbus FCOM in section
PRO-NOR-SRP-01-70 . I am pasting the statement here : “ Below 100 ft (radio altimeter), the FMGS freezes the landing capability until LAND mode is disengaged or both APs are off. Therefore a failure occurring below 100 ft does not change the category of the system.“
Having said that the issue is resolved and everything falls into place .