It's not the final plan to 2026, neither is it a complete list of everything being built right now let alone 5 years out.
Have a look at all the gaps in London, Birmingham, Leeds, Manchester, etc, etc.
Think that's a tad more than 5 million premises missing.
I can see 2 exchanges in Leeds MDC alone that are receiving Fibre First builds, that's literally the project names, and aren't featured on the map or lists.