No, you said it was a particular channel that can handle biometric security. Domestic arrivals at T5 do not require any security. You simply get off the plane and leave the secure airside area. Are you suggesting that there is a specific area of T5 that is set up simply to allow those who no longer need to travel domestically to leave?

Being escorted around the ‘border check’ is not the same as ‘being removed by a particular channel that can handle biometric security’.

And if you go through the transit route, there is no need to go a particular route through immigration. You can use the manned or egates (when open).