On the one hand I fully understand why they aren't releasing much information at all. It's the best way to ensure you have the right perp if someone confesses since they will know information that isn't public.
On the other hand I'm not always convinced LE makes the decisions when it comes to not releasing information. The one I always think of is poor Scott Ratigan. He was murdered in Arlington, VA in 2020. A year after his murder, LE released several CCTV clips they had of his murderer in the area near his building. I am a firm believer that LE made a crucial error here. They should have released those clips immediately. There was a MUCH higher chance of someone seeing those images and remembering something days afterwards vs a year later.
I am feeling similarly about the request for videos/images here. You can tell the dad wants to say more but LE doesn't want him to. Maybe LE has almost everything they need and is just hoping for further support. Fine. But if they're stuck at all I think they need to come out and give some more information about what exactly they are looking for, or not looking for, in the images or videos. These vague requests "If you have anything from the area that night please let us know" just isn't going to get everything out there. I guarantee there are people out there with a selfie of themselves or a drunk video in a bar who think, no matter what LE says, their photo is not useful. But if LE explained a bit "we need this area, around this time" I think they'd have way more luck. Could it possibly make a false confession easier? I suppose. But if they're lacking in information to find a suspect at all, they need to weigh pros and cons.
It also sounds like Kaylee's dad is frustrated. He's deferring to LE because he knows this is their job but if this case goes on much longer with an arrest, I feel like he and other parents may start releasing information on their own to try and gather more evidence. Whether you agree with them doing that or not this is reality and LE needs to be mindful of this.