Amen. I bought SR+ and spent hours debating/talking/discussing this decision with my wife. The decision would have been much easier if I knew how close the specs were going to be in the end.
Due to my role, I deal with having to reset customer expectation all of the time, including blog posts that share incorrect product information. I think the right thing for their service leaders to do is to go to bat for the SR+ customers who ask for a discount. Not all SR+ customers will be asking for the discount, so they should just try to analyze what makes sense to do from a financial standpoint. I would probably offer $500 to any SR+ owner who placed their order after the SR was added to the online configurator, without actually downgrading them.
At the very least, Tesla should go in there and edit their blog post and include some sort of apology. Leaving it up there in its current form is a mistake. Tesla has grown it's business purely on word of mouth and referrals. Now that the car can be afforded by the masses, they're going to have typical consumer-related gripes and need to be prepared to get railed in forums and in social media. Not good, as I hope the company does survive past this year.