Refusing to spill the beans is not the same thing as outright lying. GP was notoriously tight lipped to the point where you could know where some truth might be simply by his refusal to even address certain reports, rumors, or topics. But to my memory, he never threw out an outright lie to keep from telling the truth. He simply would tiptoe around topics or outright say "We won't discuss that".
Vlade straight up lied about Cousins. He could have said "We're not discussion that right now", but didn't. He doesn't have an obligation to tell all to reporters, but that's not the same thing as being dishonest.
I try not to get into these kind of discussions anymore because you have your mind made up and see what you want to see. That's not to say I totally disagree with you, but the fact is, we don't know what is, or was, in Vlade's mind. We have some people mocking Vlade for apparently asking too much for Dedmon (a first rd pick), and then people like you, who want to imply that Vlade is trying to give up Bogi at a bargain basement price.
Logic would tell you, that if he's over valuing Dedmon, he would certainly put a very high price tag on Bogdanovic, which would be more than Kuzma. Which in turn tells me, that the entire thing was started by the Lakers. The entire situation with Bogi had to do with his current contract, and there was only so much Vlade could offer him under the rules. He offered, and Bogi refused, and both sides knew that's what would happen.
If your part of the national sports media, and watching from your comfortable office in NY, you look at the situation and see that trading Bogi looks like a very viable option for the Kings rather than risk losing him in the off season. But that doesn't mean that the Kings and Bogi's agent haven't had discussions about working out a deal. I don't know, and you don't know. Personally, if I was going to trade someone, it would be Buddy. I don't think he's a winner, but that's just me.
Has Vlade made some mistakes? You bet, and firing the most successful coach we've had since Adelman is probably one of them. Right now, passing on Doncic looks like another, but the jury is still out long term. Remember, it was Vlade that had Bogdanovic included in the trade that brought him here. Yes, he traded Cousins, but to keep him we would have had to give him a Max contract, and looking back on it now, trading him was a blessing in disguise. Otherwise we would be saddled with a player on a huge contract who couldn't play. And I say that being a huge Cousins fan.
Am I happy with Walton so far? No, not really! I could go into a boat load of reasons why, but I'll spare you that right now. So at years end, if Walton gets fired, I won't lose any sleep over it. But firing both Vlade and Walton, which could happen, would be a bad idea. That would mean a clean sweep of not only the entire coaching staff, but also almost if not all of the front office staff. We would be right back to being the laughing stock of the NBA. It would be better to get Vlade to agree to become just the president of basketball operations, and then hire a GM to work under him. That way you retain some stability.
I don't blame you for being upset, but you do have to take all the injuries into consideration. Everyone is touting how well the Grizz are doing, but I wonder how well they would be doing if Morant and Jackson had been injured for a large part of the season.