What housing numbers do Labour want for Penzance??

There is a lot of talk at the moment about Penzance and the Cornwall Local Plan. It is being decided up in Truro how many houses Penzance and the wider West Penwith Community Network Area should have in the next 20 years.  So what exactly are our Labour duo Cornelius Olivier and Tim Dwelly scheming behind closed doors? I'm asking because I have no idea at all.

Cornelius Olivier is quoted in the Cornishman seeking to dramatically increase the number for the Penwith Community Network area by 54% from the original 2,500 to 3,850. You have to question the mathematical research of this housing number, when in the same article Cllr Olivier is quoted as saying:

"This (extra 1,350 new homes) would only result in around 50 extra new homes a year being built in the area over the course of the plan."

Unless I'm missing something, 1350 (number of new homes (on top of the 2500)) divided by 20 (years of the local plan) equals 67.5. The original number of 2500 would equal 125 a year. The new proposed number would equal 192.5 a year. Unless of course the councilor for Penzance Central means an extra 50 homes for Penzance and an extra 17.4 for the rest of West Penwith...

To muddle things further here's a screenshot of Cllr Dwelly's facebook page, who claims an extra 21 houses a year:

Please if I'm being stupid here, someone point it out. But it seems to me that either my maths or Labour's is shoddy to say the least. If the Penwith Community Network Area number is to increase by 1350 are the extra 1000 houses assigned for places like St Just, Sennen, Pendeen, Marazion? And 350 for extra for Penzance? Somehow I don't think so.

I had researched other things to try to scrutinise their plans and try to work out what methodology they were using to justify the increase and how they'd reached the number, but sadly I'm not actually confident what their number is, a lot less so on their methodology and research...