Ah, IBT. They are largely a scrape operation, taking original content from other places and adding a bit of click-bait. See Wikipedia for more information on their track record in this area. The actual source is The Sun, here:
https://www.thesun.co.uk/travel/1080...ing-seats-vip/
Where the story isn't quite as reported by IBT:
The airline gives special treatment for its Premier and Gold Guest List customers, who are considered too important to upset. British Airways has been failing to clean seats before flights unless it's for a high-profile passenger. Their seat, which may be in any class, must be cleaned and checked under a new company edict.
But all other passengers — including those in first class — cannot be sure their seat has been cleaned because BA carries out random checks after a sweep of the aircraft.
In other words, all seats are cleaned, there are random checks to see this has been done, but Prems and GGLs may get an extra check on top. Not that I've seen much evidence of this yet, but there again I also don't find BA's aircraft to be routinely in a bad way either, there was a definite improvement earlier in 2019 and that's been maintained with the new base airport deep clean process.