Re: A cunning plan
The reason they were using US sourced components was mostly because they were trying to break into US markets, and didn't want to run afoul of US patents that would allow competitors to block imports. It isn't because they didn't have Chinese alternatives for SoCs to put in their phones and routers - there are plenty of companies using pretty much 100% Chinese components that produce phones and other products that are sold only in China.
Now that they have to shelve the idea of competing in the US, and probably EU, they will be free to use Chinese components that probably violate US/EU patents since they will only be sold in China or in countries that don't care about restrictions (i.e. Africa, Middle East, Indonesia, etc.)
At best this will cause China to push even harder to become technologically self-sufficient, at worst they will ban import of many US products - partially as retaliation, partially to help give their home grown products a leg up. Yay for short term thinking by Trump - but hardly surprising for a guy who can't even think far enough ahead to know how a sentence he begins will end.