The report you linked was from a single healthcare organization in the UK, not the entire NHS. Also, it mainly only covers their own cases and requests, they only treated 7,000 IBD patients in the specified year.
It does state that there was a request received, and it would fund it. Dual biologics usually isn't considered until all the regular biologics have been tried by themselves. You don't seem to understand that biologics and surgery are literally the only things to combat this disease, and surgery can end up just being a bandaid:
"The only formulary identified with a policy on dual biological therapy for IBD was South-East
London which fund dual biologic therapy for severe, refractory CD in certain circumstances."