I kind of doubt he gets claimed by anyone, not even the Dodgers. I think if you do claim him you have to at least be interested in shelling out the $18M next year. Because $5M is definitely a lot for four weeks.
For the Phillies, it's pretty simple. You'd be optioning De La Cruz to make room for Robert, and Hill would also lose playing time even if you managed to get Robert time in LF (and in RF any time Harper DHs).
Robert's August numbers are impressive, but there's still a much larger body of work, and also still no indication he can get back to the player who earned those $20M options in the first place (three years ago). To think that one month means that's what he'll be for another year would be a lot. To think it means that's what he'll be for another two months is a lot! We've got the same issue with Bohm really.