Are you guys sure he is talking about Sumbul? Another YT channel which gives LF update said he was talking about Tina 😕
I don't think Gautam is talking about sumbul. If you think logically, why would he say Sumbul. He himself was advising her to be on her own. One day back, he told Shalin, that Tina looks interested in him. He has kept Sumbul Busy in kitchen duty, so that Shalin and Tina have free time. Also bachi nhi hai again applies to Tina because Tina isn't bachchi, we all say that to older ones that they are mature. Sumbul is definitely bachchi in front of Shalin. But let's see