I think it's a fair warning.

Half the comments on long blog posts usually end up discussing the headline, or even just part of it. Combine that with the difficulty people on online forums have to recognise blatant satire and you'll end up with pages of discussion about SMTP before you know it.

I see at least four top level comments failing to see the satire or talking about email. The downvotes are pushing them down, but it shows the sarcasm warning was necessary…