The Flexi-Gold ticket appears to be the normal Gold season ticket amount + £150 if you’re an adult or + £75 for a child.
At least that’s how it appears to be in the one example clumsily given by City in the East Stand Level 3.
The example given appears to be blocks 302 and 308 (rows V-Z) and blocks 303 and 307 (rows Z-DD).
These blocks and rows for a standard Gold season ticket holder cost £705 for an adult and £240 for a child.
In the example given by City, once you’ve included the extra £150/£75 then these prices tie in with the example given if attending all 19 games.
£855 for an adult or £315 for a child.
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In the terms and conditions for Flexi-Gold it also mentions that the prices of individual games will differ depending on whether the game is a category A/B or C but ultimately attending all 19 games will come to a total of £705 for adults and £240 for children, in the example blocks given, assuming the £150/£75 has been paid upfront.
In summary the Flexi-Gold will be the same price over 19 games as a standard Gold season ticket but you’re paying an extra £150 fee if you’re an adult or an extra £75 fee if you’re a child, for the privilege.