Erm... I'm presuming you didn't actually read what you quoted? It clearly states that he hasn't scored 30+ goals every time he's been a genuine front man, more like 2/5 or 2/6.
Just because he didn't score as many as Ronaldo when he was up front and Ronaldo was coming in from the wing, doesn't mean he wasn't the striker. Lampard has scored more than Torres this season, it doesn't mean that Lampard is the striker.
I've already stated I feel that Rooney was the main man essentially from Van Nistelrooy leaving in 2006 up until Van Persie came in 2012. Just because Berbatov was more prolific for 6 months, or Ronaldo was more prolific for 2.5 seasons, or Rooney was injured sporadically, doesn't change that.
Even if you discount the 10-11 season because you feel Berbatov and Hernandez were the furthest forward (which in my opinion was only the case because Rooney was injured), with Rooney behind, you are still left with 129 goals in 234 games or 91 goals in 158 league games. Basically: 2 very good seasons and 3 mediocre ones.
To sum up: my point is that the bolded is disingenuous.