After another read, prompted by this comment, I found the part they're referring to: if you click through at the top of the pdf to HLG you get here: https://home-affairs.ec.europa.eu/networks/high-level-group-hlg-access-data-effective-law-enforcement_en, and this does describe all the things mentioned in that comment!

Note that OP's link is less crazy and dangerous (in fact, in cyber security you basically assume the metadata is known anyway), but this implies coming proposals that are a lot more invasive to our privacy