Yer right about the legal technicalities and all. He's apparently done nothing illegal.
But really, using dogs to drive a critter up a tree and then shooting it. That is totally effing lame. It certainly isn't sporting.
The unspeakable in pursuit of the inedible as Oscar Wilde would say.
BTW, snake doesn't taste like chicken. It's much oilier and slightly unpleasant for that reason. Edible but not particularly desirable. A bit like eating sea mullet.