I am interpreting your question to be specifically about trade. There are lots of other areas of disagreement between the E.U. and China.
As far as I can tell, Charles Michel is not sharing his personal opinion, he is just outlining the E.U.'s position, which has been consistent over the last few years.
The E.U.'s key demands are summarized here. The current problems, as they see them are:
- A lack of transparency;
- industrial policies and non-tariff measures that discriminate against foreign companies;
- strong government intervention in the economy, resulting in a dominant position for state-owned firms, unequal access to subsidies and cheap financing, and;
- poor protection and enforcement of intellectual property rights.
On top of this, they want to make sure that trade tariffs, and investment rules are determined on the basis of reciprocity, that forced technology transfers are stopped (that's partly what is meant by "non-tariff measures"), and that there are legal protections in place, rather than just promises.
That link provides a lot more detail on status of the joint negotiations. I would summarize it as "very slow progress".