Fertility treatment is still funded by nhs to enable the partner to get pregnant
Most men with infertility are entitled to ICSI. When ICSI isn't even an option, which is now the exception rather than the norm, donor sperm is available. This is indeed questionable that it should be so. If anything, the NHS might decide to stop funding couples who fall in that category.
But again, it's not funded for the healthy person but the one with the issue. Again, it's the woman who has to go through the treatment because biologically only she can carry a child, but it's not for HER benefit.
I am the main registered patient at my clinic, not my husband
That's totally irrelevant to the reason why treatment is funded. It is funded because of your partner's condition. That's what triggers eligibility.
It's really not that hard to understand!