It looks like HomeKit BlueTooth range is extended by other devices in your house!
Update: I am not 100% sure this is what is working for me, it seems that the distance between the Aqua and the Apple TV sometimes reaches sometimes it doesnt. But I will keep this post for now until someone else share their tests too.
Today I bought an EVE Aqua, essentially a way to control a water tap from your mobile device. While setting it up, I was able to make it work on my dinning room table. But when installed in the patio which is some more meters further away from the Apple TV 4K (which is acting as the Home Hub) the Bluetooth signal was not reaching to the Apple TV.
I was not planning to move the TV nor the Apple TV to another location because its just impractical. I must confess I first tried “helping” both devices by wrapping them in tin foil from behind to try to concentrate the signal towards each other (I dont even know how Bluetooth signal works) but it was worth trying, as I read it helped some people boosting drone range signals. Also, it was so easy to try, so why no? unfortunately that didn’t work.