My, oh my, that is a long list of mods (139)! I was able to recreate the issue with a subset of mods from your list (in order):

Harmony Brrainz
Core Ludeon
HugsLib UnlimitedHugs
Industrialisation TrashedDT
More Trade Ships PinoChemicali
Orbital Animal Traders Horologium
Rich Traders tfave
Let's Trade! EarthyTurtle
The Rock Trade EarthyTurtle
Wealthy Traders 1.1 TRP
[KV] Adjustable Trade Ships - 1.1 Kiame Vivacity

I also tried moving Industrialisation to the bottom so it loads last, but that didn't resolve the issue. I'll let you know what I find out, but it's definitely one of these mods. Harmony and Hugslibs aren't suspected, but are required for 'Let's Trade'.

So in my testing, the problem was isolated to 2 mods. It revealed that Let's Trade and Wealthy Traders have the greatest impact on the spawn rate of the deep space miner.

With Wealthy Traders, the traders added by it's mods, Textiles and Liquidator, appeared 58% out of 100 spawns. The deep space miner only appeared 2% of the time. 40% was vanilla traders.

With the Let's Trade, it's traders showed up 76% and the deep space miner never appeared out of 100 spawns. 24% was vanilla traders.

I'm still looking into mitigating this issue, and haven't decided how to address the issue yet but wanted to share this information.

@TrashedDT Pal,you are great thank you for your info,i am looking forward for any development.

Hi, any updates?:)

Hello, sorry if I am being annoying but is there an update? Love the mod btw

@Xan, @EFlo, I do not have an update. To compensate for the mods that jack up the spawn rates of their traders is not trivial and I haven't had time to implement a good solution due to RL. I wish I had a better answer, but honestly, my free time has been very limited since Oct 2020.