Dont take it to hart he is a busy man. As for him being a Nissan man???? I know of several 4gs he has tuned one of which is a 7 second pro car he knows his shit with them, I've had mine tuned at 2 other places prior to Matty an will NEVER go anywhere but the pits.
He is not cheap, always busy that tells you something.
I know that vehicle I have my own workshop just up the road from them most of the 4g's he's tuned are for the same mob I'm not debating he knows his stuff and he's done plenty of 4g motors he got my odd ball engine running on the first turn of the key (after we actually got power to the ecu) to be able to take an engine you've never seen before and make 3 tweaks to one of your own tunes and have it fire on the very first time the ecu has been powered takes a special.
My point is he has his favourites he also tends to quote harsh and stick to it until he knows you and the car. I suspect that's his way of filtering customers who may give him trouble.
Again to reiterate Matty is an awesome tuner who gives you no bullshit. He was straight up about what was happening with my car (severe misfiring) yet still managed 160awkw from a 1.8l most would have given up.