This isn't an argument. If I used a word to mean the opposite of what it actually means I'd want someone to point it out. Just like if I get an author's name wrong I'd want someone to point it out. (Thanks for pointing it out.)
He didn't use "sarcasm" to mean the opposite of what it actually means.
Because his post could be read as sincere (unjustified) criticism of Google, he used the well-known internet convention of "/sarcasm" to avoid an unnecessary, off-topic sub-thread stemming from his post. How's that for irony.
