Both of these cameras satisfies my definition.But only one is qualified
as an SLR why ??

This website may help
http://www.steves-digicams.com/digi_dictionary.html

From there

ZLR - Zoom Lens Reflex, a term coined by Olympus to describe their fixed
mount lens SLR type cameras. An SLR camera has interchangeable lenses, a ZLR
has a non-removeable zoom lens.

Toa