With the low flow being only on the hot side, it is possible that the problem is at the water shut off. Please check the pressure at the supply.
If that is not the issue, low flow on a touch faucet can be troubleshot as follows:
First, please check the wand for debris or buildup. If there is debris or buildup present, clean the wand with a 50/50 solution of water and white vinegar.
If no debris is present in the wand, run the faucet without the wand, if the flow issue is resolved, you may need a new solenoid.
If the low flow is not corrected, please remove the hose and run the faucet with the hose removed. If the low flow is corrected, you may need a new hose.
If the low flow still exists, please remove the solenoid and inspect the debris screen. If debris is present, clean the screen with a 50/50 solution of water and white vinegar.
If there is no debris, run the faucet with the solenoid removed. If the low flow is resolved with the solenoid removed, you may need a new solenoid.
If not, you may need to backflush the supplies.