https://ali.mk/posts/the-role-of-noises-in-chinese-dining-et...

https://www.reddit.com/r/China/comments/6w5hux/slurping_nood...

+ personal questions to real Chinese people.

First link: That is a Swedish robotics blog and the sources linked are just landing pages for Chinese tours or language lessons.

Second link: Where do they say that 'making loud mouth noises is a sign of respect'? They say 'people slurp noodles' which is exactly what I said.