table header accessiblity error

Table header fails in the accessibility check done by the Accessibility Checker tool (adobe.com)

I am not sure this is correct as it says the update now spots the table header errors which it couldnt before- however i have correctly tagged the header cells (as outlined in the guidelines ) and it is still coming up? So I wondered what is going on?

and why do we need to run this register key as it suggests on this page, if it is simply ' bypassing the error, and does not flag or fix the missing table header accessibility issue.' Surely we want to be able to identify the error?

I cannot make sense of this. I wondered if anyone can anyone help me as I really want to know how to resolve this and make sure my documents are accessible?