Saw this lands deck, is this competitive at all?

https://mtgdecks.net/Legacy/%E3%82%B9%E3%82%A5%E3%83%AB%E3%82%BF%E3%82%A4%E5%A4%89%E5%AE%B9%E3%81%99%E3%82%8B%E6%A3%AE%E6%9E%97%E3%82%B3%E3%83%B3%E3%83%88%E3%83%AD%E3%83%BC%E3%83%AB-decklist-by-%E3%83%9F%E3%83%AF-%E3%83%AA%E3%83%A7%E3%82%A6-3002486

What’s the reason stryfo thief with dack is no longer viable ? Is it even worth making and practicing in a competitive setting ?