Not saying goth isn't better cause it objectively is, but this is rather reductive. The argument that dug traps a small portion of the meta is 100% bs and i think everyone knows it. Running a variety of sets tailored to getting certain threats is not unique to goth, Dugtrio has a number of viable sets depending on what you need removed..
His argument at its core is that trapping means nothing if Duggy loses the matchup (if it's dependent on set, that's a whole other ballgame), so being reductive is sort of the point. Counting how many threats get trapped on either side is a meaningless statistic and a bad argument to make. Look at how many threats get trapped, and then look at the matchups themselves to see if trapping is actually beneficial for the trapper. Compare those numbers to get an accurate comparison of Goth vs Duggy (ferro is a decent example of a trapped Duggy mon that means nothing, while Goth could cripple it). Besides that, looking at the abilities themselves, if we're going to deem one or both uncompetitive, it is important to note the fundamental difference. Ghost mons, which are sparse in the meta, are the only mons escaping Tag while Trap has levitate users/flying types/ghost types and all the other methods of escaping Tag as well (voltturn, shed shell, with the addition of AB).