Given that ships often cut undersea internet cables and China has the biggest export economy, doesn't it make sense that the most likely country to accidentally cut an internet cable would be a Chinese trade ship?
On average, it seems like undersea internet cables break 200+ times per year. For example, Vietnam's internet cables break on average 10 times per year.
What would be the motivation for a Chinese trade ship to deliberately cut an internet cable? It has next to no impact on internet communication and only serves to annoy a small amount of people for a short period of time. In addition, China and Europe are trying to have a better relationship in general so it doesn't make sense for the Chinese government to order this.