Earlier quoted context omitted.
Do as I say, not as I do? Is that still a popular way to communicate moral messages? Even coming from Disney in the first place the message came across as the old argument of a priest-of-past-sins being preferable to a priest-of-purity.
What, exactly, are you implying is the "as I do" part here? Are you saying that the employees that make up Pixar are, on the whole, frequent and regular customers of the fast food industry? I would expect that living in/near the bay area would give them good odds of being in a different demographic.
Intentionally try to send a message to a demographic by placing Wall-E in their natural path would be a decision made by the corporation well above the level of Pixar's animators. That body would almost certainly be the same one that green-lit the avalanche of Cheap Plastic Crap.
So, even if they believed Pixar's message, and were intentionally trying to preach to those at-risk, they were saying "you should learn from Wall-E" (do as I say) while simultaneously saying "also, buy this plastic crap" (not as I do).