In 2013, I wrote about Hymel on this website:His career began as early as 1998, but picked up steam very slowly (which is not a bad sign), until big success came in 2008 and 2009.Well, I was wrong about that. His Pinkerton turned out to be very unremarkable, the voice was too small for the Vienna Staatsoper, and a bit stiff to boot. When he came back five years later, in 2019, to sing Rodolfo, the voice was already ruined, and he was unpleasant to listen to. What a pity. And in fact, it was just (good?) luck that I got to hear him at all in 2019, because already since 2018, it seems over for Hymel: he cancelled most every of the (few) performances he had been scheduled for anywhere on this planet, his website is offline, he doesn't post any longer on Facebook... In 2022, he became a voice instructor at a music college in Princeton, New Jersey.
Side note: the Covent Garden Robert le diable production (broadcast by the BBC) was originally meant to "star" – Juan Diego Flórez, of all singers! As Robert, not in the tenor buffo part of Raimbaut! Fortunately, Flórez withdrew in time; certainly Escalaïs must have raised from his tomb and threatened him so as to achieve that.