The "electric" share here includes plug-in hybrids which, if we're nitpicking, have an internal combustion engine. Doesn't affect the overall conclusion as even if they were all hybrids the number of cars with internal combustion would still be lower. I'm very, very bullish on EVs, they're going to take over the world rapidly but this graph isn't great support as you can't see the exponential rise very well and it's…
The conclusion seems pretty shoddy as well, since it relies on a few years worth of data to indicate a permanent shift in purchasing habits, and those years include a global pandemic, supply chain shortages and high inflation/interest. Really the only conclusion I would make is that combustion-only has peaked, and that much is very clear if you go and shop for a new car. Everything is being hybridised.
But, if one digs a bit into the data then one finds that EV sales in nearly all countries had double digit increases. The two major exceptions are Germany and Italy. But on the other hand the Chinese market both grew substantially and there it is more or less a policy goal to boost local manufactures and those are ~all electric. And if China is not going back to gas-powered cars then the conclusion is a pretty safe bet, isn't it?