I just found it quite peculiar because even a dumpster fire like Kanojo no Tomodachi has comments:
It's most likely because Magazine Pocket is not where the series is primarily published.
The series releases on Young Magazine (physical/digital magazine) and their website Yanmanga (which doesn't have a comment section in case you're curious).
They just sublicense it to Magazine Pocket. Also on the Magazine Pocket version you need to use their premium currency to read it, unlike native Magazine Pocket series which you can read for free. Kanojo no Tomodachi, which is also a yanmanga series, actually lets you read up to the second latest for free which explains the massive comment and favorites difference.
The amount of people who pay to read the chapters vs the ones who read for free is night and day. Almost nobody wants to pay to read an entire manga on an app. You can even see it in your own screenshot. The premium latest chapters have 10-20 comments, the free chapter has 200+.
Lastly, this series is really not very popular at all. Last time I looked it up on Japanese image boards and social media there was barely anyone talking about it.
So yeah, no wonder it's got an empty comment section. Very few people (by serialized manga standards) are reading it over in Japan.