League 1 clubs can only spend 60% of their turnover on wages. Turnover is made up from matchday income, commercial income (sponsorship), tv rights and profit on player sales.
So players sales enable us to operate within FFP when other income sources are limited. This is all part of being sustainable.
Capital Investment in infrastructure, stadium, training ground etc, all come outside of FFP rules. Our board members have personal wealth way beyond the figures being spoken of for a new build. They can "invest" in this project and will see a decent return if you include all additional income sources that go with a new build.
Operating costs and stadium builds are two entirely different budgets. We could have a billion in the bank and still need to sell in order to invest money back into the playing squad.
You don't need a source at the club to explain this, it's really very simple.