It is not quite that bleak. They went from 100% EV for all new car sales in 2035, to 90% EVs and 10% being allowed as combustion engine cars.
It's not 10% of combustion engine cars being allowed. The entire car fleet produced after 2035 was supposed to carbon neutral but now the goal is 90% reduction. The estimates I've seen say that with the new rules 20% of cars will use combustion engine after 2035. The 100% CO2 reduction is no longer planned at all.
What this means in reality is that the industry can keep making combustion engine cars forever. There will not be any hard limit on the numbers of combustion engine cars sold, it will be still be up to the consumers. To compete with China on EVs European companies would have to invest a lot of money into it and they don't want to do it. This is basically their way of backing out of the competition. People will keep buying gasoline cars and the industry will say "what can we do? people don't want to buy electric cars. we missed the targets, sorry". When this happens they hope EU will move the targets again. This most likely means that the automotive industry in EU will die and people running it know it but just want to suck as much profits out of it as possible before it happens.
We'll see how it all ends. Right now best case scenario is that automakers in EU go bankrupt as fast as possible, Germany looses leadership position in EU and stops fucking things up for everyone.