What is it with #UKIP, Nuttall and his 7,000 veterans sleeping rough? Figures say its closer to 400!

In a recent speech, Paul Nuttall, UKIP leader spoke of 7,000 veterans sleeping rough:

https://alt-politics.com/2017/03/04/nuttall-we-will-stay-strong-and-radical-under-my-leadership/

However, various newspaper reports (like this one)

http://www.mirror.co.uk/news/uk-news/9000-ex-service-personnel-homeless-after-2071049

Say 9,000 are homeless and veterans account for 1 in 10 rough sleepers.

And this report

http://www.homeless.org.uk/facts/homelessness-in-numbers/rough-sleeping/rough-sleeping-our-analysis

says UK only has about 4100 rough sleepers in total so using these figures together, while 9,000 veterans are homeless, only around 410 are actually sleeping rough...

I am sure I have heard Paul Nuttall use this figure before and am sure I have heard it challenged, I wonder why he and his people are still getting it wrong?