Is the wiki accurate about faction from these two mobs?

[DeathsSilkyMist]

Sadly the wiki is mostly wrong when it comes to faction. They scraped the data from Allakazam I believe, which is out of era. Unless the mob is well known to give big faction boosts (like Velious city bosses), there is a good chance the mob probably just gives 1 or 2 faction points. Most mobs are this way on P99. You will probably need to test it yourself if you want to be sure.

For Warrens faction farming mass slaughter is generally the better way to go since there are so many mobs.