You're right... correct grammar and spelling are overrated with respect to effective communication.
Just a bit of friendly sarcasm there, but really, you seem to make the reader's inability to decipher poor writing/typing as the reason the message was lost. I myself had to read over it multiple times with some trial and error as to what was intended and eventually I figured it out. God help anyone who doesn't speak English natively.
More than a few sentences of that and screw it, I won't bother trying. That's unfortunate since the post was relevant and added to the conversation; but let's not downplay the GP's culpability in this mis-communication.