certainly it won't hurt to do yoga to help your flexibility and posture (espec. core tone), and you can probably make it look kinda sexy on cam since a lot of guys like crazy sex positions/angles and yoga pants
but as they say, 'abs are made in the kitchen', 'losing the stomach' is just basic physics, calories in vs out. the beauty of that is it means you can do what you prefer -- you can workout so much that you struggle to eat enough to keep up (look at the forced eating guys with huge amounts of lean mass have to do), you can control your diet really carefully so that you really don't have to exercise at all (fine if your life is too hectic to spend hours to-at-from the gym), or you can do some mix of both, improving your cardio/strength/endurance/etc. a little, and watching what you eat a little, so that you don't risk eating too much, don't feel like you're depriving yourself, and aren't neglecting your overall health/physical abilities. It's just a matter of knowing what works and what doesn't work (so you don't waste your time or get discouraged with dashed expectations_, and doing what works for you (so that you can do it with little effort, indefinitely).
the downside of a goal like 'losing the stomach' is that your body may not preferentially burn fat stored there, so you may find you're getting a smaller butt/bust/thighs/etc. before you manage to get the stomach you want. the upside is that it doesn't mean you
have to do sit-ups or weighed crunches or cardio or any particular kind of exercise you hate or can't do for health reasons, and doesn't mean you
have to 'eat better', you can just eat
smarter or work out more and keep eating how you do.
apologies if I'm saying shit you already know, not trying to mansplain
I just know there are still a lot of myths and misguided ideas/efforts out there.