Shouldn't be that difficult to squash these asumptions by just verifying that they are indeed working on a patch to the patch to the patch, by just telling us they do.
The thing is, 1.6 should've been bufixing only but instead brought the game to a disastrous state. 1.6.1 was able to get it from disastrous to "playable, but so many aspects of gameplay suffer and misfunction, I'd play it for bugfixing and experimentation, but not to relax and enjoy some deep space stragegy". 1.6.1 came out fast, so good job on that. But still i rather play other games then Stellaris until i can somewhat trust my game to not goof around as it does now.
The circumstance of an ongoing multiplayer-tech-test - while the main gameplay that affects multiplayer and singleplayer alike is still that bugged - this just sounds weird. I guess they just had this multiplayer stuff ready so now they are testing it, but i don't know if this is something as with graphic guys that can't do bugfixing instead of drawing portraits. The fact that this multiplayer test is a reason to not put out DDs does feed the impression of pdx doing multiplayer tests instead of direly needed bugfixes for the bugfix-patch. Hopefully this asumption also is wrong, but the 1.6. patch has done it's share to make me wary.