The following is the timeline :
Post #4746 Deino commenting about a Block 3 maiden flight
https://www.sinodefenceforum.com/jf-17-fc-1-fighter-aircraft-thread.t5634/page-475#post-581296
Subsequently posts #4747,4749-4760 (14 posts) were discussing about Block 3 maiden flight
Then Seige posted the picture (post #4766).
Yes, the rumours of JF-17 Blcok III making its maiden flight were posted on Dec 16, and the last post in that particular chain talking about Block III was on Dec 17.
Then it was followed by posts 4761 to 4765 which were not related to Block III (some being pictures of cockpits of JF-17, some being pictures of JF-17B).
And then Siege posted his picture in 4766 on 25/26 Dec that he described as "Supposedly an image of CAC testing the air-cooled AESA radar on a JF-17 Block II."
For completeness sake; By78's post was also unrelated to Block III and it's obvious his post was part of a chain that was talking about JF-17 in general, including multiple pictures of JF-17B in particular.
Neither Siege's post or By78's post could have been reasonably interpreted to specifically relate to Block III either in the context of the posts made before their own posts, or in terms of the content of their own posts.
Further, your previous post also said "On the day the news surfaced about Block 3, there were two immediate posts associated with the story" -- yet both Siege and By78's posts were many days after the initial news about Block III's maiden flight and indeed even multiple days after the last discussion of Block III in the thread in Siege's case.
I'm not trying to do a "gotcha" moment or anything, because I think this is just a genuine mistake, and people make genuine mistakes all the time and it doesn't detract from anything. There's a lot of content to consume, and organizing when everything happened relative to each other can be difficult, so I get it.
But I also am also willing to go the distance to argue that neither Siege nor By78 were suggesting that the air coolled LKF601E was the radar chosen for Block III.
If you had interpreted their posts as doing so, then I believe you were mistaken.
If you truly want to insist that you think your interpretation of their posts were reasonable for someone who had read the sequence of posts (and when they were made) carefully, well I really don't have anything else to say.