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WhatsApp group chats are end to end encrypted too. You must be thinking of... Telegram, where only secret 1:1 chats are end to end encrypted

Group messages are also end-to-end encrypted.

This was in the news some months ago, they have backdoors for 1:1s that they use to comply with government agency and police data requests. Do go look it up.

This is untrue.

https://signal.org/blog/there-is-no-whatsapp-backdoor/

This has not been found, that would be major news on mainstream channels. (Do go and cite sources.)

If you need some obscure news source for this, it's very unlikely to be true and unless you or a trusted friend of yours has reasonable expertise in the relevant field (reverse engineering or cryptography might be relevant, perhaps both depending on the type of backdoor) you can't rely on some controversial source being correct.