QUOTE (Runners Companion p.115)
The character’s unique stomach and intestinal organs (including
unusual gut flora) can digest a variety of substances that
normal metahumans cannot or have trouble digesting, such as raw
meat and cellulose-based plant material (like grass).
In game terms, Lifestyle costs are reduced by 20 percent and
the character receives a +2 dice pool modifier on Tests to resist
ingested toxins (see Toxic Substances, p. 245, SR4).
QUOTE (SR4 p.338)
Digestive Expansion: This treatment expands the
range of substances a metahuman can safely digest—including
roots, grass, peat, and a number of plants that are
normally considered inedible. Includes a modification
of the taste buds and olfactory senses to make it easier to
“stomach� unusual foods. The character’s lifestyle costs
are reduced by 20 percent and she receives a +2 dice pool
modifier on tests to resist ingestion-vector toxins (see Toxic
Substances, p. 245).
QUOTE (Runners Companion p.78)
A (deltaware) digestive expansion implant (p. 338, SR4) allows
the Infected to process a more varied diet, allowing them to
ingest things that would normally nauseate them without penalty,
but it does not alleviate their dietary requirement.
RAW, no, Ogre Stomach does not allow a Vampire to consume "normal" foods. However, it is beyond reasonable to rule that it does, & I would likely bitchslap a GM who does not allow it.