You mean the rainbow colour scheme? They've been using that a lot since start of covid for psychological programming. And not just for LGBT stuff.
I got the image from Wikipedia's 'vaccination' page.
here are the details for the photo from Wiki-
Description Photographer: Heather Hazzan; Wardrobe: Ronald Burton; Props: Campbell Pearson; Hair: Hide Suzuki; Makeup: Deanna Melluso at See Management. Shot on location at One Medical.
Date 1 August 2019, 00:00
Source Young girl about to receive a vaccine in her upper arm
Author SELF Magazine
And they started using it on Wiki in sep 2020 according to wayback machine - just before the jab rollout.