No, I have not. You are failing to see that the two overlap.
No, I am not using a non-sequitor fallacy. You are making a logical jump that does not follow. I have not said at any point that the decision to charge means the evidence proves beyond reasonable doubt that the defendant is guilty. That is not for the CPS to decide. That is for the jury.
In simple steps...
To charge, there must be a realistic prospect of conviction.
To get a conviction, the prosecution must convince the jury that the defendant is guilty beyond reasonable doubt.
We can therefore rephrase the charging standard as there must be a realistic prospect of convincing the jury that the defendant is guilty beyond reasonable doubt.
Therefore, unless the prosecution has evidence that they believe shows beyond reasonable doubt that the defendant is guilty, there is no realistic prospect of conviction.
They may be wrong. They may have assessed the evidence incorrectly. There may be evidence of which the prosecution is not aware. Their evidence may fall apart in court.
You are absolutely right that the decision to charge does not mean the evidence proves guilt beyond reasonable doubt. It doesn't. That is for the jury to decide. But that isn't what I said.
A decision to charge does mean the prosecution believe they have evidence that will prove to the jury that the defendant is guilty beyond reasonable doubt. That is what I said.