it seems that wikipedias processes work
It looks like wikipedia's self-correcting processes are working, at least in this case.
The wikipedia article now mentions in its introduction the accusations against the party leader, and his denial - as it did before this register article was written - so readers are aware of the controversy.
When the register article was published, the admin mentioned was actually under investigation for questionable judgement and actions, and subsequently lost admin privileges.
If anyone is interested in the background, they should check the Wikipedia article's discussion page. In their own way, these pages are often as interesting as the articles themselves...
For what it's worth, the wikipedia article is rated as "B", which means: "Useful to many, but not all, readers. A casual reader flipping through articles would feel that they generally understood the topic, but a serious student or researcher trying to use the material would have trouble doing so, or would risk error in derivative work."
No idea how you'd mark a Register article on such a scale :)