I get 1.22MB in Firefox with a similar approach:
1. New private browsing window
2. Open devtools networking
3. Responsive design mode: Galaxy S9
4. Load reddit.com
1. New private browsing window
2. Open devtools networking
3. Responsive design mode: Galaxy S9
4. Load reddit.com
>>>DOWNLOAD THE APP<<<
[0] https://f-droid.org/en/packages/org.quantumbadger.redreader/