Dimensions are extremely complicated.
The number of dimensions in space and in matter is something that, despite extensive mathematical analysis, cannot be definitively proven.
Logically, one can only find a method of understanding that is consistent with existing scientific discoveries and does not conflict irreconcilably with established scientific laws.
Therefore, the work of Zhao Yi, Edward Witten, and Zhang Qican was not to prove how many dimensions space actually has but to find a way of understanding that aligns with scientific findings.
In the end, they concluded that space should be understood in three dimensions, whereas mass points and matter are of higher dimensions. Moreover, energy is limited by dimensions and can freely travel through multiple dimensions.