When one is lucky enough to have a Final Salary Pension (Defined Benefits, DB) it provides for a contractual obligation by the employer to provide a future financial benefit based on a series of rules. Pension trustees run the scheme, advised by actuaries who financially model the assets (of the scheme) versus the future liabilities.
Why tell you something you probably already know? - because trustees are under no obligation to change the contract obligation (say, when Government increases state retirement age from 65 to 66) - but some pension trustees in similar schemes have done so - according to your research. Maybe they have also downgraded part of the benefit in order to fund it - who knows, but I don't see how it changes anything for you.
The second thrust of your complaint seems to be concerned with comparing your COPE to your deductive component (DC). But you are comparing eggs with bananas, and unsurprisingly, one is bent whilst the other isn't yellow. The DC represents a figure derived from the reduced amount of employment years that you will not pay into the scheme (9 in your case), it does not directly relate to the value of the COPE. As far as I know (and I know less about DB schemes these days as I don't have one any more) they have to show that the benefits are worth at least the bought-out element from the state scheme. That was certainly true of Defined Contribution Schemes - the more usual scheme these days.
If I was in your position, I would be spending time trying to ensure I maximised my position based on the rules I can influence. Don't know about your particular scheme, but trying to ensure you maximise the salary on which the 'final year' is based, by for example, being paid for holidays, not taking them - some schemes allow for this. I've already clocked from your earlier post that you can't tweet the figure by use of overtime. Then there's the murky business about redundancy payment - depending on circumstances it may be worthwhile paying part of the redundancy into a stand-alone pension pot - to avoid tax on it if over £30k.