Was there a stream on Twitch yesterday from the Lusors Ark?

And, can you watch a stream afterwards? So, the next day the recorded, on Twitch?

Do you mean "https://www.twitch.tv/...oeffizient"? Since there was apparently yesterday (Friday, 2019-02-22) no stream to "Ark", but one to "Apex", as far as I can see. The day before yesterday (Thursday, 2019-02-21) there was probably an »Ark« stream.

As long as the streamer has activated or not deactivated, you can see the corresponding recording for a few days after the streaming on Twitch on the videos of the streamer. Here are the videos of »LusorKoeffizient«:

https://www.twitch.tv/lusorkoeffizient / videos

There's "yesterday" ark extinction… But many thanks! Unfortunately, I know zero.

Yes, there was "yesterday". I think this is because the server is probably set to UTC for the time. Therefore, it was only for the server [2019-02-22, 23:50, UTC] when it was already [2019-02-23, 00:50, MEZ] in Germany. Therefore, the server considered the video (recorded 2019-02-21) at this point in time as "yesterday" instead of "the day before yesterday". At least that's my guess.

Anyway, the Ark Stream's record dates from 2019-02-21, which was "the day before yesterday" at the time of my response.