I noticed that you can load the mod without having the DLC enabled in Steam if you remove references to "frozen" and "heating", since the graphics for the turbo belt are already included in the mod. Can you implement this, or would it break ToC of the Factorio DLC?

I think the main problem would be using the official graphics.

No, I won't, I even plan to use https://mods.factorio.com/mod/saplib and remove image in my mod to use game file graphic directly, it's obvious it would be illegal to upload space age content without require DLC and anyway I wouldn't insult the dev of factorio doing that. Space age cost only 32€ and it's worth the prize by far.

Any adaptations or works derived from the Factorio assets are permitted to be included and distributed as part of your mod. However Wube Software Ltd. still retains all rights and license to these assets and the work derived from them, and reserves the right to request removal of these assets from your mod. https://factorio.com/terms-of-service

I don't want this mod get removed and so no require DLC is mandatory in my eye

I think you can use the DLC graphics directly, without needing to use Saplib, but Saplib has the advantage of not needing to copy the prototype data in this mod.

In either case, do you plan to merge this mod with TurboBeltOnNauvis? I think it's confusing to have both of them.