Yup still mines, can't bare to part with it even though I've threatened to several times. My new employer since October last year, great industry to work in. If you spotted the car, does that mean we're colleagues? ;p
The last video sounds like VANOS, car is warmed up and gets louder and the first few video sounds like chain guides.
For me, this is just typical 540i maintenance, expensive but just wear and tear of / bad design.