"there is absolutely no information on what this mod actually is"

https://mods.factorio.com/mod/Construction_Droneslk same as https://mods.factorio.com/mod/Updated_Construction_Drones

This one has cute little robots, but misses the mark:
they're not available immediately, so blueprints aren't ...

TL;DR
A cute little buddy crash-lands with you, builds stuff, and keeps you company.

What?
My imagination can't help but conjure WALL-E. R2-D2 fills a similar role.
TV Tropes: Cute Machines


available immediately
performs same actions as construction (and logistic?) robots
moves as ...

What if bots were able to transport some items but not all?

So you could update your lategame factory to move all your ores around with bots, but you'd still need belts for intermediates and science packs.

0.15.x on the left, my MS Paint mockup on the right.