The lesson would be to use as nearly as possible the original publisher (the ISO in this case), although in many techncial fields that is hindered by sheer cost.
UK organisations like the BSI have presumably been ordered to stand on their own two feet commercially; but have a comparatively limited market of principally, government departments, companies and academic institutions for whom the cost does matter but is comparatively low, even an investment.
It is worse still for scientific journals as many of the leading ones have been taken over by big publishing firms who erect very hard and very costly barriers. These have been known to obstruct even authors trying to read their own papers in the original journals!
I fear a lot of people becoming horribly unstuck by thinking AI magically, automatically all correct all the time. Well, even the brightest humans with RI can make mistakes, so why should AI be any more reliable? Being really a glorified, high-powered filter and text-matcher, if it picks up the wrong stuff or misinterprets the right stuff it can only relay the wrong stuff.
If the originator of standards or other technical material is accessible without a mortage, surely that should be the first choice?