These types of claims are incredibly difficult for a layperson to evaluate. There are at least two explanations for charging very little profit as is suggested BYD and similar companies are doing now.
Incumbent monopolists will absolutely use prices to bully competition out of the market so they can enjoy a longer period without pricing pressure later. This has been well documented across many industries. However it's also a normal occurrence where a disrupting upstart will apply a low profit margin or even operate at a loss in order to build market share and achieve higher efficiencies of scale.
I am at least mildly concerned that the Chinese EVs seem better fit the mold of the disrupting upstarts, and not that of the incumbent monopolists. If they are serving a lower-price-point aspect of the EV market that the traditional manufacturers are not filling -- that is a good thing. This is a role that many of the brands now considered mainstream once filled when they were newer to the western markets.
However, your points towards forced labour are absolutely on point. This is a greater issue that affects all trade with China, and it's one that we have largely been ignoring for a long time. Every time we buy something made there with it's unknown providence, we are participating in a system that must be described as evil. I wouldn't want to drive one either.
I would LOVE to see HBC reborn as a costco style membership club that sells good quality Canadian products at reasonable prices, and is incentivized by the membership system to focus on providing customer satisfaction not short-term profits.
I've given up Costco for the boycott, but it hurts so much buying overpriced stuff from the grocery cartels. Imagine if a reborn HBC could fill that role?