The apps listed in the spreadsheet are clearly sorted by number of features supported (with weights). I don't think OP is necessarily claiming IRC is more secure than Signal.
They are sorted largely by security, according to the author.
"It is currently roughly sorted by security. Usability is subjective and people can work down the list to the most secure tool they feel they can comfortably use."
You are correct. I generalized this as "roughly sorted by security". Some in the list, like Tox, have notable design flaws, but this list is binary and does not account for implementation quality.
This is mostly for discovery of options to consider diving into.
He's not correct (as he has since acknowledged!), and you did, and still do, suggest that placement on the chart implies greater or lesser security. You literally included instructions on how to read and use the chart that make that point. "Usability is subjective and people can work down the list to the most secure tool they feel they can comfortably use."
