This is very good advice. Most likely it will be ignored and we will here the gnashing of teeth in 60 days when people get scammed. The offer to send a test board by itself has no merit. Actually sending the test board has merit. Thus anyone basing their buying decision (or decision to keep pre-order) on the offer is not making a sound decision.
Granted there is the greed/fear factor. Their website does a good job of that. ONLY 100 AVAILABLE. SPECIAL PRE-ORDER PRICE. That is all the bait. Implied message "You have to ignore everyone else and send us the moniez now or you will lose".
Granted like I said anyone who has already made up their mind is unlikely to be convinced but the quoted is good advice.