Agreed, the dealers will NOT have performed any updates, they do not have the ability nor inclination to do this (if they can short cut & get away with doing nothing then they will), I have first hand experience of this.
I'm also very dubious of any updates ever being applied.
This appears to be an urban myth perpetuated on the internet.
Until Honda publicly announce that an update is available please do not keep repeating untruths.
Any official update will have a Honda technical publication stating the process of how to apply it with details on how to confirm that it's applied, no such thing currently exists in the UK.