I traveled about a month ago with a group on LH (there were actually 2 groups, and many single yidden on that flight). I was sitting on the upper level in business myself and the others downstairs. After takeoff the purser comes over "all your people are not wearing masks and are using their phones which interfares with the navigation system". First of all, no one was using their phones, but he was able to see that 70 phones are connected to the FlyNet which is allowed as you're allowed to use PEDs with Wi-Fi and nowhere is he able to see that's not an airplane mode ( want to even pass me while I was listening to a message on my phone and it told me You're not allowed to talk and I showed him only listening to a message and my phone is an airplane mode). Either way, I went to check everyone was nicely wearing the masks and just driving me nuts.
Thank god they couldn't kick us off the next fight because we had our own charter
So yes, I experienced it first hand, and many fellow DDFs told me that week that they flew LH that week and no one made them crazy about masks