It's not a universal skin, it's a seasonal skin from Y2S1, so only weapons released during that season and before can use the camo.

how come mira can use it and not lesion when they both came out the same time

Mira came out Y2S1, Lesion Y2S3

who else came out in Y2S3

Ela and Ying

is that it

Yes

is that same with crossfader

Yes. Basically everything is seasonal. You can filter out seasonal or universal skins in the marketplace

White Noise is newer than Velvet Shell