For what it’s worth, every modern Omega I’ve owned—including my Aqua Terras—have loosened over time. 100% of them.
But I do tend to wear them on the looser side, generally, and there is an argument to be made that wearing them looser actually contributes more to stretch than wearing them tighter—more movement over time.
And to be clear: I’m talking about a mm or two of stretch, but that’s probably all the op needs.
Some modern Rolex use ceramic pin sleeves, I believe, that completely stop bracelet stretch. But I’ve never had an Omega (well, except for ones I hardly wore) that didn’t. …Just me?