No. Strength does not increase swing speed. It increases damage independently of power strike in addition though.
I'm going to assume that he is referencing the fact you can be a 10 PS tank with 132 WPF on a 30/9 build. You are barely slower at all with swing speed than a balanced or agi build.
15/21 build with 7 WM: 164 prof. Leaves you with 5 PS.
So you get half the PS for a measly 35-40 wpf?
Not worth it imo, but since I'm a rather poor blocker I need high athletics to benefit from my footwork.
Strengthbuilds have all the advantages atm. 1 hit kill most people, can't be outspammed, average speed compared to everybody else (mostly other strengthbuilds).