(Deleted post added for context.)
'Is that another way of sayin you don’t know Pete? Caught you out haha.
Just seems like bleed nipple should be at other end of calliper.'
No. It's just that where moisture gets in is at the reservoir. The amount that will get down behind the pistons is minimal. Generally what you are flushing out is the old fluid and any mank from the master cylinder seals or bores. When you change the pads you'll be pushing the caliper pistons all the way back. Then you bleed and flush out the caliper fluid. Simple.
If the nipple was at the other end of the caliper you'd just end up getting virtually unflushable air into it rendering it a cunt of a job to bleed. I suggest you experiment with the rear brake on a V1 Tuono if you want to find out what a complete prick of an idea that is!
Don't over think it. Just bleed it conventionally.