800 gold to wipe out a bunch of free units seems silly. Besides that he was supply blocked for the entire last half of the game. He'd need 5 population to make both of those (not to mention get them to there safely!) and he only had enough to make waters.
For Wyz, before he made the last treature, I think going for a scorch attack on the whole enemy scorpling army would give you enough progress and temporary advantage to take down at least one treature with your scorplings, if not two. And would at least reduce lag for a while. If you backed off, made sure as many enemy treatures had spawned in their 3 scorplings and then hit them all with an AoE, I reckon you would have enough time during the cooldown between spawns.
No need, as Wyz had the ghost helping him from the start, and his opponent couldn't have out treatured him, but I still think it would have been viable to do so.