The point wasn't that they were choosing specific transactions, but that they were such a high percentage of the whole network that it resulted in that.
The extent to which that participation was useful in undermining the network was undetermined.
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Show us the report
I was wrong, or at least, passing on unverified info.
Sorry.
The info I shared was not from an article, but from a twitter account that has since been deleted. The post did include a link to this article:
That's a different thing altogether.

WIRED
The Dark Web’s Favorite Currency Is Less Untraceable Than It Seems
Researchers point out serious gaps in the privacy promises of stealth cryptocoin Monero.