Let me get this straight, correct me where I'm wrong:
The story is a shitty isekai about a WW2 vet that attracted the attention of the fantasy gods for being so good at killing chinks with his 1000 times folded nihon steel katana that he gets reincarnated into their world, sans his memories.
This shitty isekai is about to get an anime adaptation, but some butthurt chink notices the stupid premise (which apparently bears no importance to the plot since the MC actually forgets everything about his past life) and proceeds to complain about it.
The chink also digs up the author's four year old tweets which are unsurprisingly racist and raises hell about it.
Turns out there are chink companies and chink staff that will be involved in the production of this shitty isekai anime and they're not enthusiastic to be branded traitors by the entire chink internet for a couple of shekels, so they quit.
The VAs notice they're on a sinking ship covered with flaming poo, so they quit too.
The production company and publisher notices they're standing next to flaming poo and it'll probably affect future business with the chinks, so they quit, deciding a shitty isekai adaption is not the hill they want to die on.
This leaves the author, ostracized despite his apologies, standing alone in a pile of flaming poo that was once his writing career.
And somehow we're supposed to feel sorry for this fucking idiot who not only cannot write for shit, but also neglected to scrub his social media before working with people from the country he regularly shat on?