I never read those magazines and I can't say I'm an expert on dungeon map styles, but it's the hatching done in the dungeon walls that Dyson is known for (e.g.,

I never read those magazines and I can't say I'm an expert on dungeon map styles, but it's the hatching done in the dungeon walls that Dyson is known for (e.g., https://dysonlogos.blog/2011/09/03/dungeon-doodles-a-crosshatching-tutorial/ https://dysonlogos.blog/2011/09/03/dungeon-doodles-a-crossha...). It looks like the person that made this program started playing around with the idea May 9 (https://twitter.com/probabletrain/status/1259172635776294912 https://twitter.com/probabletrain/status/1259172635776294912) a day after Dyson started tweeting about his program (https://twitter.com/DysonLogos/status/1258797586464542723 https://twitter.com/DysonLogos/status/1258797586464542723). I think Dyson's program is just a Photoshop extension and Dungeon Scrawl looks way more powerful, but it's worth pointing out the very similar timelines and styles.