Why would Argos want to put advertising on their website? At completion of a sale?
The revenue is marginal, unless they are in on any clicks-through. Yes it's one more form of loyalty scheme in theory. Or the opposite for the thinking classes.

These are not tinpot companies, it's Sainsbury's.

And the poor lad at the counter has heard it from many customers.

Argos asked for feedback, did they actually read mine?

I know from others that they bothered to put the statement in an e-mail that they "don't publish negative reviews". You would expect that to be the case, but to admit it is something else.