Yes, LOTS of TM refreshers going on these days, sometimes the TC will even stipulate that the TM does a two-day course rather than a one day course. Also some TMs may need to do a FORS-approved TM Ref course and there’s only a relatively small number of TPs who can supply that (about eleven in the country IIRC)
It makes sense if people want to get their own TM-CPC, but lets not pretend that it is easy, generally about 50% of candidates fail these exams.