We must understand the history that led to the installation of the safety screens to understand why the expert said what he said.
The incidents of passengers falling onto tracks had reached an alarming statistic that many people were crying for safety screens to be installed. MRT stalled in this decision making, saying this was not necessary. A few more deaths occurred within a short time, so much so that further delay in not installing the expensive protective screens became untenable.
Only a psychologist would possibly have a hint whether among the deaths, more have been pushed or jumped. Very few survived to tell their story anyway.
The latest victim from Thailand claimed she was pushed. Whether she was actually pushed or was avoiding a push and fell in accidentally or, in fact, it was just a pure accident, the fact remains that accidents and incidents can occur on the train platforms if there were no protective screens.
I believe it can be proven mathematically that the more crowded the platform the greater the chance of accidents taking place. If the expert dispute this, I will have a very big question mark on the professionalism of this expert. Very likely the expert was only trying to protect MRT's lack of action in the first instance.