I think you could probably say either decreasing or increasingly negative, but not decreasingly negative, because that would describe a sequence that starts from a negative number and moves towards zero (but hasn’t gotten there yet)
To be fair, a list of things obscure in 2022 will naturally be weighted to dated software that became obscure with age. I'm surprised to see xterm on the list, but I guess most people are using more modern terminals, or urxvt if they prefer it retro.
The obscure part of xterm for me was the built in tektronix (vector) terminal emulation. I remember digging up a .dvi viewer that could display on tektronix by drawing a _lot_ of horizontal lines.
I remember checking some of these out from CVS and killing a bunch of processes so my machine didn't hit swap when compiling it.
You'd use ctrl+alt numpad keys to switch resolution and color depths sometimes if you don't have a lot of video memory. You could get high resolution, low color or low resolution high color.
Then it was finally re-licensed under GPL-3 for the OLPC as SimCity, and for any other use as Micropolis in 2008 (with the multi player stuff disabled because the X11 network protocol was not safe or simple enough for kids to use on a mesh network):
I appreciate it nonetheless.
I browsed around the site and I found this collection which I like a bit more
https://cyber.dabamos.de/88x31/index3.html
It appears to be in roughly alphabetical order by topic, which is quite an accomplishment