Yes that's right, only the Poco F5 without Pro has a 3.5 mm headphone jack.

Can you link us to the test in question? Then we'll look into it.

I generally advise against buying smartphones from Aliexpress, because it is always a risk. What you get there may be a phone that has already been opened or one that supports other networks like those in Europe. You often only get a Global ROM, which is not the same as an EU Global ROM. Also, you usually have to pay a lot of fees, because these devices from Aliexpress are often held back by the authorities so that the VAT can be collected, and if this is done by the post office, they legally collect a COD fee for the service. It's usually not worth it, because there is zero guarantee via Aliexpress. This is only exciting for cables, everything else is better and safer bought directly in Switzerland.