What does "customize" mean in that context for Heming Hu, since the same phrase will be used for top players but with clearly different connotations but which are not always clear to a outsider? That is what I am pushing back against, this belief that a top pro (Ma Long, Fan Zhendong) is always willing and able to access things that are not commercially available and that are fundamentally different from and better than what is commercially available. Most of the time, the customizations are commercially available because it is in the interest of the brand/manufacturer to make them available.
For a long time, Timo pushed back on the problem of the CNT playing with rubbers that he couldn't buy on the market. Nowadays, there are marketed versions of what top players use. Whether you can boost as well as those guys etc. and then activate the equipment as well... my point though is that in terms of quality, it is not as simple as "he is a top pro, he is using something that no one can ever access".