Although the author points out that single core performance hasn't improved since Sandy Bridge (2011) and multi-core performance has been largely lackluster since then.
While I agree it's shameful for Apple to be selling the current Mac Mini, the performance from 2017 chips is going to be only ~20% better than what's in the Mac Mini now. [0]
It's not a completely fair comparison because the i7-7500U is 15W, but I can't find any Intel mobile CPUs released in 2015 or 2016 which were dual core and didn't have a 15W TDP.
[0] http://www.cpubenchmark.net/compare.php?cmp%5B%5D=2345&cmp%5...