This is not true, check part fcl, you need to fulfill the 70hr PiC+cpl skilltest etc.
and realistically speaking, MPL trainees have 10ish solo hours in a single pilot airplane and 60dual, so ability to fly a single pilot aeroplane is demonstrated in that sense.
Realistically speaking, how would a hobby license such as ppl or lapl combined with an MPL demonstrate legal proficiency for SPO at a commercial level..... ppl isn’t professional flying...