Saw this episode when I was relatively new to anime and even now after having gone through hundreds of more titles, nothing has really come close to reaching the same level of highs for me.

In addition to what others have mentioned, I think if you ask for sources they're basing their opinions on and point out objective problems with them and associate them with the US media's atrocity propaganda track record, I don't really see how it can be seen as anything other than being about media literacy rather than holocaust denial.

Some sources that I think should cover most of the problematic narratives surrounding the issue copied from my response in this thread https://hexbear.net/post/39756

Debunking stuff/illustrating the widespread problematic reporting surrounding this issue:

1. one million uyghur claims/Zenz/US-backed NGOs - https://thegrayzone.com/2019/12/21/china-detaining-millions-uyghurs-problems-claims-us-ngo-researcher/
2. forced labor camps/ASPI/Zenz/Falun Gong/US War Machine - https://thegrayzone.com/2020/03/26/forced-labor-china-us-nato-arms-industry-cold-war/
3. unreliable witness testimony - narrative changes from "did not personally see violence" and "there was no meat" https://www.theglobeandmail.com/amp/world/article-everyone-was-silent-endlessly-mute-former-chinese-re-education/ to "there were all kinds of tortures there" and "meat was served on Fridays, but it was pork" https://www.haaretz.com/amp/world-news/.premium.MAGAZINE-a-million-people-are-jailed-at-china-s-gulags-i-escaped-here-s-what-goes-on-inside-1.7994216
4. photos/videos that are straight up mislabeled - https://factcheck.afp.com/these-photos-show-protests-istanbul-and-xinjiang-and-migrant-shelter-thailand https://factcheck.afp.com/no-not-video-chinese-soldier-beating-uighur-muslim-having-copy-koran https://factcheck.afp.com/video-shows-police-officer-pinning-down-drunk-chinese-woman-his-knee-hotel-shenzhen https://twitter.com/j_bigboote/status/1182726991675625472
5. shitty guesswork based off of satellite images/mosques being "destroyed" - https://medium.com/@sunfeiyang/the-case-of-the-keriya-aitika-mosque-efa29e456339
6. more shitty guesswork based off of satellite images - https://twitter.com/ChengxinPan/status/1310051540397297665
7. blatant propaganda witness testimony/Campaign for Uyghurs - "my friends and family are in concentration camps" from a Uyghur activist who worked at a CIA propaganda outlet and fucking Guantanamo Bay during the Bush administration https://www.reddit.com/r/IAmA/comments/e9ad4n/

What is (most likely) actually going on:

1. Not genocide - world bank investigation/statement: https://www.worldbank.org/en/news/statement/2019/11/11/world-bank-statement-on-review-of-project-in-xinjiang-china
2. BBC visitation with heavy editing and mistranslations - https://medium.com/@sunfeiyang/breaking-down-the-bbcs-visit-to-hotan-xinjiang-e284934a7aab
3. Unedited visitation to a camp and interviews with Uyghur students there - https://youtu.be/Jp5y9LCZqTA I made a post about it including parts that the translator had left out here https://hexbear.net/post/33959
4. All the Muslim countries side with China and even US-aligned Saudi Arabia sided with China since they had sent diplomats to visit Xinjiang and its re-education camps - https://www.economist.com/china/2019/07/27/chinese-actions-in-xinjiang-become-a-matter-of-international-dispute