There were a few RM YOs who did the in-service degree and took academic terms at BRNC but this was in the early 1990 and only lasted for a few terms. Also as an officer it is rare to complete two specialisations (M&AW and WTO) due to career progression. His time as a Capt and Maj also seems based around CTCRM and this is not the norm. I would expect him to have done jobs elsewhere within 3 Cdo Bde.
As as to training with Portugeese SF. Well I mean I've done a exercise with the SAS, as a maritime planner. Yes I trained with the SAS but the way he implies is he did the knife fighting black masking tape stuff where as I furthered my combat skill of Word and Excel. But put it on a CV and there we have a little glamour.