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Your main point of little overlap between EV and ICE drivetrains is surely true.
Your second suggesting Sony knows more about EV battery setup than ICE companies seems unfounded.
"Sony Corporation manufactures audio, home video game consoles, communications, key device, and information technology products for the consumer and professional markets. The Company's other businesses include music, pictures, computer entertainment, and online businesses."
Sony and Panasonic compete in several markets but battery cell and EV drivetrains aren't one of them.
Sony is entertaining the notion of coming out with an EV because they are even more clueless about how difficult that is than Audi and other ICE vehicle makers.
Sony was the first company to commercialize lithium-ion batteries -- beginning in the early 1990's. While they did sell that line of business in 2017 and they weren't able to compete on price very well, it wasn't that long ago and they likely have a lot of retained know-how and institutional knowledge (and likely even royalty-free licenses on their former battery technology to the extent that's worth anything).
Not in the same league as Panasonic or Tesla, but that's definitely a step above ICE companies.
And, Sony is also a world leader in imaging and seems to be taking a similar approach to Tesla in autonomy. Again, that's way ahead of ICE companies.
Like Apple, I don't think Sony necessarily will sell an actual car, but they are positioning to act as a supplier to other OEMs and could theoretically muscle their way into building an actual car if the OEMs don't bite. And again, like Apple, their core skillset of industrial and software design, along with their imaging and battery know-how, are more useful to the future of cars than anything ICE manufacturers can offer.
On the other hand, Apple hasn't succeeded yet (or even shown us anything) and they have a lot more money than Sony. And, Sony has definitely stumbled in the past.
(Btw, this is a welcome diversionary discussion from watching the stock price and interesting, I think, to the long-term competitive landscape for Tesla)