That's one way you could interpret it. You might say the same thing applies to visa overstays in the US, which isn't a crime and essentially unenforced except at easily predictable attempts to elicit self snitching at inland border checkpoints.
The US immigration authorities do occasionally do raids on employers that are known to employ lots of illegal immigrants (which can be people who simply walked over the border, or people who overstayed a visa). It's not unenforced. For people in higher socioeconomic strata that blend into the population better, it's not that well enforced probably because it's just hard to find them, and local law enforcement doesn't deal with it.