it’s not.
But, I would suggest you look for an alternative.
It doesn’t matter what frequency you use for this, so just replace the 125kHz xEM Access Controller with a 13.56MHz alternative.
You have a number of choices.
You could buy off the shelf the HF equivalent of the xAC, like this.
https://a.aliexpress.com/_mP84VUU
OR
If you are familiar with arduino, then you could make your own
OR
A community member project