I just went through the Sloth true ending today and even went through the credit scene and let Judas stop speaking his lines, but still no luck.
Viewing post in Sinsations - A BL / Yaoi Visual Novel comments
Hmm, that is odd; I've not heard of this happening anywhere else and just tested it myself.
The bonus tab appears in the main menu, not the Hellphone. If this doesn't work, you can email me or contact me on Discord, and if you zip up your save file I can take an exact look at what is happening.
My Discord is Whitehand#3403 ( ^^)/
Email is sinfulwhitehand @ gmail.com