Tuberculosis test - UK Spouse Visa

I've read that when the partner visa holder arrives in the UK for the first time it is essential that the Tuberculosis Certificate is presented to the interviewing UK Border Agency (UKBA) officials on arrival.

My husband is planning to arrive in September 2021 and his Tuberculosis Certificate expires in August 2021. Is it going to be a problem? Does he need to obtain a new one before arriving in the UK? 

US citizens do not require a TB certificate. If he is from a country that requires one, logic would be that it would need to be valid for entry.

All UK visa applicants who are a resident in a listed country, need a tuberculosis (TB) test, regardless of what foreign citizenship they hold.
https://www.gov.uk/tb-test-visa

The link does state that the certificate is only for 6 months. You could ask your question on immigrationboards as they would likely know.

Thank you all for your help.