I'd like to see the specific articles or links you've come across on it. Google works but I'd rather know what caught your eye instead of whatever the search engine pushes. Tesamorelin probably isn't disappearing though. You mentioned CBL-514 hits subcutaneous fat while tesamorelin goes after visceral fat. Stacking them might carry risks but it could also leave someone looking pretty gaunt.
There's this new injectable called CBL-514 that could work well and safely for cutting localized fat under the skin in the belly area.