I'm not sure the AP is reporting his statement correctly, but I can't say for sure since I don't know Arabic and haven't seen a translation.
But I'd venture to guess that al-Masri is claiming 4,000 coalition troops have been killed since the invasion (US, UK, Poland, Japan, Italy, Canada, Ukraine, etc).
In any case, al-Masri would not describe jihadis as "foreign fighters" being "killed", but as holy warriors being martyred. And he would need to add a zero to that number to make it close to being a realistic jihadi casualty count.
The past two weeks have been the two most violent weeks in Iraq's recent history bar none. Al Qaeda delivered on the 9/7 threat to make the following 15 days a "kill zone".
They will attempt to deliver on this Ramadan threat as well.
Al-Masri tape first. Then Zawahiri. Then, if successful, UBL.
Thank you nw.