That's a shame, I've had some Yoni from Sainsbury's before and didn't remember the womxn thing.
I think amazon have been given a different spin, the website doesn't use womxn.
It avoids the word woman as much as it can.
I found one on the all about page:
We believe all women and people should know what their most intimate products are made from. That's why we list our ingredients on the pack. This sounds normal, but unfortunately it's not the standard. By leading the way at Yoni, we hope other companies will follow suit.
With the above, surely it's actually better to call a transman a transman?!
That's the only word woman I can find on the website. People appears at least twice.
I did find this though Sainsbury’s has even announced to aim for “plastic free periods” by 2020 so it may be worth looking at what every brands they sell?
I used to get the attached in boots but they stopped stocking them. This website likes women. They seem to be an Australian brand.
I now use modibondi period pants but have been told Sainburies period pants are also great. (I don't work for Sainburies 
) it sounds like they may have made a decision in that area hence good stock.