They have names I assume. They can hide, but we can't it seems.
Actual link to the legislation: https://www.europarl.europa.eu/RegData/docs_autres_instituti...
It’s not an overwhelming read.
Key takeaways: no one bans encryption or mandates back doors. No one requires companies to do this, but this suspends the ban on doing it (temporarily).
Additionally, you cannot be sure your line is encrypted on many services. That is a loss in my opinion.
It's good to be worried that this might happen, or that businesses might do something voluntarily as an extension or whatever. But it's not the same as "EP passes legislatino forcing businesses to install back doors" which is parroted by the PP over and over. That's hyperbole (to not say outright bullshit).
A slippery slope is just a fallacy in a way that there might be insufficient proof for a certain consequence. I rarely read it applied correctly on the internet, although it became quite popular.