What's good about Phind is even if it gives a wrong answer, it gives you a link to a website where you can try to verify the answer.
FWIW my query for your question gives me a pretty good answer. The first list has three options, one of which is soldered (and the answer says so). It narrows it down to unsoldered ones when I ask.
https://www.phind.com/search?cache=kukryw72yutlp4u88nubmjuu
This answer is mostly good because it relies heavily on an iFixit article that it provides as the first reference. That's what I like about using Phind, it's as much a search engine as an oracle.
https://www.ifixit.com/News/35377/which-wireless-earbuds-are...