Lol, maybe the author does not understand the graph?
"Despite this, Nvidia still maintained dominance in Q4 2019. It represented 63% of market share compared to AMD's meager 19% and Intel's 18%."
Additional note: The provided data isn't easily to use, because JRP takes everything with a GPU into account, therefore all APUs (and in this context, almost every Intel consumer/desktop CPU is an APU because most of them have an iGPU) and also add-in boards.
Furthermore, JPR analysed for 3Q19 and AIBs a share of 73 % for nVidia and 27 % for AMD.
So, over all, Intel theoretically is the GPU market leader, but with regards to only AIBs nVidia is still the absolute market leader.
One additional note: There's not much to use from JPR, because their main intention is to sell their report for 2750 US$, so they are very careful not to uncover relevant numbers from their analysis, but one still should be available:
The report states "quaterly shipments", therefore quantities, every Intel-releated component is a CPU, because Intel currently does not sell discrete GPUs, the number of low-end Xeons E's possibly can be ignored? Therefore with 93 Mio. units total in 4Q94, they assign about 59 Mio. CPUs in 4Q19 to Intel, almost all of them for the desktop and mobile market.