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People get really cufused.
The switch has a feature called HDMI-CEC which is designed to let it switch TV inputs, and power the TV on when you dock the system, or wake it up. That feature is what gets disabled with when you disable the "Match TV State" option. That feature on the Nintendo switch is implemented properly, and will work with any TV that has CEC support (which is marketed under silly names like AnyNet+, Bravia Link, and dozens of other names).
However some TVs also have a feature that detect when a signal suddenly appears on an HDMI cable, and either automatically switch to that input or at least pop-up an input select window to give you the chance. The idea here being that if a signal suddenly appears, either you just turned something on, or just plugged it in. In either case, you are quite likely to want to switch the TV to that input.
There are also automatic HDMI switches (not to be confused with the Nintendo Switch) that also detect if a signal is being sent in a somewhat similar fashion.
Unfortunately there is a bit of a design flaw with the Switch. While in standby mode it will occasionally transmit some super brief signal. I'm not sure if this is a black screen, or some other non-image signal, but whatever it is sending, it is enough to trigger the TVs and HDMI switches with these features. The exact cause of this is not proven, but I strongly suspect the following explanation is the case.
Like most other devices, in standby mode the switch occasionally wakes up briefly to do thinks like check for updates, or to check for new eshop purchased that should be pushed to the system. When it temporally wakes up, the dock notices and begins transmitting a signal. Since the system is till in standby (despite being temporally awake), it should not have transmitted anything.
This is the sort of issue that can quite likely be corrected with a firmware update for the console and/or dock (which would be updated by the console).
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