Don't exaggerate. The cameras always on sale are the S9 and the S5D. Also the S5II and S5IIx has gotten much cheaper, but only in a expected way regarding the the time on the market.
The new S1 Generation wasn't much on sale, it stained at about initial market price for months, the S1II basically until the end of the year.
And regarding a market share chat from last year, it was the release of the S1RII and later, the S1II, what gave Panasonic it's biggest push in market share.
However, I don't say the sales of highly discounted S9 and S5D did nothing. But it's only half of the reasons for the rise in market share.
It depends. As I mentioned above, the "loss leader offerings" are only a part of the reasons behind the higher market share.
The market for cheap cameras was always a space for entering and testing a system and the photo/video hobby as a whole. If only 10 % buy more than the kit, it's probably a success. Panasonic has some good offerings for the first lens after the kit. Especially the 50mm f1.8 is a good candidate as such.
For lens Panasonic lens sales, I see a bigger problem with customers how went for Panasonic with the more expensive offerings, the S1II or S1RII. Those two were bought extensively as a kit with the new 24-60 f2.8, Panasonic introduced alongside those cameras. But I think many decided for Panasonic because of the Sigma lenses that you can't get for Nikon and Canon cameras. For demanding customers, Sigma has probably a better lens offering compared to Panasonic.