I wouldn't say your 'e' is at tin-foil hat level. But your assertion that since Trump is president any attempt to establish that Huawei is flawed from a security perspective is some 'corrupt' plot by Trump to benefit him financially is pure political imagination. Go ahead and take issues with Trump, his policies, his words, his actions, I don't care, but please do not pretend like just because Trump is president that magically the PRC and companies which are essentially controlled by its government are some kind of benign actors. Trump and has taken a hard-line against anything China since he ran in 2015, his anti-Huawei is very much in line with that stance. Also, Trump was pretty clear he wanted an American first economic policy, which makes it obvious he would be anti-expansion of any Chinese technological products.
TR;DL Trump being president has not a thing to do with whether or not Huawei and the PRC are attempting to infiltrate the network and data infrastructure of the world at large.
d. Admitting how they found the backdoor would reveal other issues (a source in the pipeline, or their own backdoor in something Huawei made use of).
And probably e-z too.