Did you ever fully read the final report on that training incident? I mean, I am not a fan of Smartlynx, but they are little to blame in that incident. And you might actually want to credit their instructor for bringing a plane with essentially only manual trim for pitch control and a double engine failure back to the runway without leaving a smoking hole in the ground.
About having them on your CV... in times of need, airlines are not all that picky about previous employers. Typerated and hours on type is what they will care about first and foremost. But we are in any case quite far from any pilot shortages in the coming years I suppose. Why anyone would take Smartlynx up on this expensive typerating and 'job guarantee' is a mystery to me.