This is actually a big deal. You can go right through Hong Kong and never leave Mainland jurisdiction.
Talk about showing who owns who.
There was a bit of moaning about it in HK, but it was off the front page news fairly quickly.
I've been trying to see how that works for 15 minutes now and the furthest I get is to Tuen Mun, which is still in Hong Kong. I'm probably missing something trivial.