Given those companies are in China, where the western media doesn't really browse the forums (nor can most of us here easily know how to read or parse it) we don't know of all the issues that they may have undergone. However, just from a quick search, I found a major problem with XPeng's OTAs:
Also problems with the cars:
Google Translate
I'm sure it'll be easier to find more if the reporting and the forums are in our native language.
Also, I noticed from the article, the XPeng G3 only sold 15,124 units in 2019 (after launching in December 2018). People gave Ford plenty of grief for the slow rollout of the Mach-E, but in the 6 months of this year they already sold 12,975 units, so they will significantly surpass 15k this year fairly easily.
Ford Mustang Mach E Sales Figures
Nio didn't seem a whole lot better. They launched the ES8 at end of June 2018. Throughout 2018 they were in the headlines of major websites for frequent software problems. Don't know if it was lost in translation, but it also seems their updates can fail (the same problem Ford is having!) Their updates didn't switch to adding new functions until around June of 2019. They didn't even have ACC until 10 months after launch! It would seem a lot of the initial updates is more like the infotainment updates that some automakers count as "OTA" (which many "traditional automakers" have done years ago) but are much simpler to implement than things that might affect the drivetrain and other parts outside the infotainment system. (Note the
bold parts below are not my emphasis, it was the article author's)
https://translate.google.com/translate?hl=&sl=auto&tl=en&u=https://zhuanlan.zhihu.com/p/103324454
I don't see any evidence they had an easy time developing/launching their software (even if they set up their cars to support OTAs from the founding of their companies).