White people probably weren’t calling for a wider range of skin shades for plasters, and so may indeed never have thought about them until Tesco promoted their range.
That doesn’t mean that people haven’t been on about it for ages.
I can remember when you couldn’t buy non-Caucasian skin tone make up on the High Street. I can remember the days before prosthetic limbs were not matched to the user’s skin.
And I can remember people asking for these products. It goes back way earlier than the timeline suggested on that FB page