Yes, that scene but I think it was more deep than that. By watching the abs's conversation, I realized that they already lied so often before. But I will leave it to your side to decide.
I will explain more about it. When they started the abs topic, Hobi immediately admit by himself that he does not have abs at all at the time. I assumed that he said the truth i.e. he does not have it at all, and the members know it.
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JayK, later will be a tattletale, then checked his abs and not following their conversation anymore because he was busy with himself.
Despite that J-Hope already said that he does not have abs, the other members except V started to play along by lying that the abs already in there.
RM: "J-Hope will reveal his abs"
Jin : "He's been working hard for 3 months"
RM : "J-Hope, you exercised so much. I saw that"
J-Hope : "I did work hard"
It got worse when Suga joined the conversation by saying : "His abs are well defined"
J-Hope startled but decided to keep following their game by saying ""Oooo. defined"
Then Jim!n, who just smile from the start when the topic was brought up, then said a diplomatic statement to save him by saying: "No matter how it turned out, Hope really worked hard".
So far their plan was going smoothly. They want aRmy believe that Hob1's abs already in there and will be revealed later. And then JayK, who has finished check his abs, out of nowhere reveal the truth:
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And the damage is done. Look at RM and Jimin reaction, they laughed loudly because shock that their lie has been revealed. There is no abs from the beginning. Look at J-Hope's reaction as well. His lips move forward to express his feeling, he got annoyed as well. And it was more interesting to saw Jin's reaction, he got annoyed and said "Mwoya".
And then we could see JayK lost his word and said nonsense things after that. The atmosphere was awkward since then until at 7:26 second, started from Jimin, then J-Hope, Jin, RM and V, all of them look at the same direction. I believe there is someone who asked them to change the topic, probably their manager and then V (who was very quiet since the beginning) started to take the control and changed the topic.
Also anyone who knows, I wonder about this: "What does the drunken people look like?" Is it enough to say that BteeS got drunk in that VLive? They look normal to me.