The wording on the FOI response says it would be too expensive to get all details of transactions with Rangers and Celtic since 1980 but also says that this does not fall within the FOI boundaries as most of the information is publicly available.
They were, however, able to return details of all money owed, paid and collected by GCC from Rangers/Sevco/Celtic (they are different and treated as differently) and vice versa from Rangers/Sevco/Celtic to GCC.
That blog (written by a madman, clearly) doesn't even say it was sold for a £1 - it uses the term "rumoured".
Celtic and GCC were locked in a dispute about the land being sold for Commonwealth use.
The District Valuer was called in - now, if Celtic and GCC were in each other's pockets, that wouldn't have happened.
Celtic were given far less cash (£250,000) for the Westhorn Rec ground than Celtic valued it at (£5,000,000) and Celtic have to pay the GCC £32,000 a year to use land for car parking facilities when these facilities are otherwise not being used and, I think, these premises were part of the sale that was almost forced by GCC (the dispute went on for 2 years).