This particular story relates to the hardware infrastructure behind the 5G network. There will always be concerns behind such equipment bought in from elsewhere, especially when oversight of the manufacturing process is difficult. There is certainly a belief that Huawei might come under pressure from the Chinese government to install ways in which the system could be manipulated for nefarious purposes. It's also worth considering that this would almost certainly be counter-productive in long-term relationships if it was activated. Against that, a breakdown of relations, or a feeling that trade was less important, could lead to a belief that the risk was worthwhile. Just look at the question marks over Kaspersky, which were raised without any concrete evidence of anything actually sinister, but which had an air of credibility due to Western relations with Russia.
In terms of whether to buy a Huawei phone or tablet - well, I have one and I'm sure it'll go on working. However, there was a recent hiatus in its update service which, it was speculated, might have had something to do with US/China trade relations. Such things can affect any manufacturer, of course, and for all kinds of reasons, so I don't think it's a reason to avoid any particular one - and certainly not to advise it.
