I don't know what team you have been following. Strahm was already the Phillies third or fourth starter when he replaced Suarez. And then he wasn't, and they have definitively stated he will not start again because he can't even be expected to pitch 80 innings this year, let alone 120.
The only thing I found curious about you starting this thread (before you mentioned it was a mistake) is that you thought this was big news, because he's not really "starting' the game and also, he "started' the last bullpen game. He pitched two innings and threw 22 pitches before being succeeded by Vasquez (good) and Covey (bad).
And it will probably go about the same tonight. The only question is can they do it without using Covey at all. In that last game he allowed the only 2 runs in a 4-2 win, but that was also against a bad team.
The 5th starter problem is vastly overstated anyway. Falter was already the worst starter in the league. They have hovered around .500 with him and they have hovered around .500 without him. If the top 4 starters and the offense perform (as you not the bullpen is fine) they will get by with any old arm or bullpen games for another five weeks. Then you start to think about upgrading. It's just unfortunate Painter can't do it.