Can BDXL compatible PC recorders read 4K UHD Blu-ray?

[phbart]

Hello there. I was wondering if anyone can give me a little help on this. I was looking at these two models from LG, WH14NS40, WH16NS40 and WH16NS60. They can burn BDXL triple layer 100GB and quad layer 128GB. I know there's no quad layer 128GB discs for UHD, but there is 100GB. Since these models can burn this type of media, logic sugest that it can read too. Right?

I'm asking because these models are a lot cheaper than the Pioneer BDR-211UBK, the only one officialy supporting the 4K UHD format.