Light Metering Question

i understand under exposure and over exposure....my thing is when he says " I'm at ISO 200/ f/22/ 1/250 and it indicated a correct exposure"...did he manually set that all up or is that what his camera told him to do after he picked his aperture and iso in manual mode.. and i find that if i know i want say f/11 for my shot and its bright out so im using ISO 100, and i know i need a faster shutter speed of say 1/250 ..but i adjust my light meter to "0" and i notice in my shutter speed in the view finder has changed to a slower one due to me doing that..is there a way to avoid that?