Drop Rates Nerfed?

There has been a lot of speculation recently about Jagex Nerfing the rates of Monster Drops.

Slayers and trainers have been complaining that some monsters are now dropping valuable items less frequently. The Abyssal Demons and Spiritual Mages are both commonly accused of having rarer drop tables.
However this post by Mod Nexus clears up any confusion:

Mod Nexus (Jagex Mod) – 24-Jul-2009 10:06:06

I’d like to confirm once and for all we have not changed any droprates and I can’t remember the last time we did, probably the summoning charms from various creatures ages ago.

If something like this changes it will be in the patchnotes.

And then another post by Mod Nexus at 24-Jul-2009 11:47:16

As an example: the code relating to the drops of whips has not changed since the 28th of March 2008 (which turns out to be when we changed the amounts of charms dropped as I mentioned before).