https://blog.roguetemple.com/what-is-a-traditional-roguelike...
1. Permanent consequences
2. Character centric
3. Procedural content
4. Turn-based
Check out some of the entries from past years, along with their “how roguelike is it?” scoring.
OP's blog post is from 10 years so I can't blame them. But today "Roguelike" is usually something slightly different.
A roguelike these days is a game that has (at least some) procedurally generated content and permadeath without meta progression.
A roguelike purist would call these roguelites.
Definitions change over time, often you can't do anything about that. But I would expect those two not to deviate too much in the future (hopefully).