Lol I said that a few years back on here & was criticised that the fttp fibre wouldn't come via the fttc cab etc. I was always fairly sure it'd come from the cab direction myself
They were actually correct in pointing that out.
That's because it won't come from the FTTC cabinet.
Coming from the cabinet direction is very different to coming from the cabinet itself.
The fibre for the FTTC cabinet and the fibre for FTTP both originate from the same exchange, both from an OLT (also known as a Head-End).
They both run to the exact same fibre Aggregation Node, which may or may not be near your cabinet.
There's already ducting and/or poles between the Aggregation Node and your cabinet, and between your home and your cabinet. So they will often use the same route as the current copper feed.
The fibre for FTTP won't touch or use the cabinet though. It will only share the ducting to/from the cabinet.
Sometimes they feed FTTP in more of a straight line from the Aggregation Node and don't go "via" the cabinet at all.
It's always been correct to say the fibre for FTTP won't come from the cabinet, though it could pass through the ducting at the front of the cabinet.
*Subtended Head-Ends are a very recent exception to all of the above.
They are basically mini versions of the FTTP OLT's (usually based in the exchange) that they bolt on to the PCP to boost the range of FTTP.
They utilise spare fibres from the FTTC cabinet.
They aren't very common and are usually used in very rural areas.