> Zoku meian [Light and Darkness continued], is a tour de force in which she creates a very plausible, stylistically pitch-perfect ending to Meian [Light and Darkness], the last, unfinished masterpiece by Natsume Sōseki, Japan’s most important modern novelist.
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> As a fragmentary, dependent work, standing in relation to a classic text that is largely unknown outside Japan except to a handful of experts, it is, in effect, impossible to render into comprehensible English or, for that matter, any other language
If "Light and Darkness continued" had been written as a continuation of an English translation of Meian, it is likely that it would have failed to gather any significant readership except translated into Japanese as Zoku meian. That's simply due to targeting an audience that is already familiar with Meian and might pay attention to a well-written continuation.
A similar problem arises for Star Wars novelizations, without any translation involved. Being invested into the universe that serves as backdrop for the story is essentially a prerequisite for becoming a reader. If you tried to "translate" an English Star Wars novel for the English mass market, you'd fail the same as when translating a novel full of Japanese cultural references for the same market.
The "homogenizing danger" then isn't so much about writing to be translated, but about writing to be read by the largest possible number of readers, be it in translation or not. Other literature can exist, but you shouldn't expect it to get popular outside a small niche. Sometimes the niches are separated by language boundaries, other times they're not. I'd assume translated Star Wars novels to also appeal to Japanese Star Wars fans, for example.