As I have already previously mentioned, I dont have a problem in jacking up the car, however, this is only because I know of the issues, and that I consciously make an effort to position the jack so that it will not carch on the plastic sill.
IMO, the jacking points will take the weight of the car , but the problem is that whatever type of jack is used it has to be placed precisely in the correct position, which can be a little difficult due to the plastic sill sitting so close to the jacking point.
Larger trolley jacks like the ones used at most tyre bays have a larger diameter lifting cup so therefor it will catch on the plastic sill as it lifts, so if a larger trolly jack is used then the car needs to be lifted under the wishbone (front) or suspension spring hanger (rear).
I do agree fully that Peugeot should address this problem, and at the very least they should of re-designed the plastic sill on the new model so that it allows more room around the jacking points.
But as we are stuck with the current design, I think it's a case of correct positioning of the jack, and/or asking tyre fitters/garages ect, to lift at the above suggested points if they are using a trolly jack with a larger diameter lifting cup.