They are technically venomous. Venom does not need to be injected through hollow fangs. It needs to enter the blood stream through a bite or sting.

Do you consider heloderma to be venomous?
Do you still consider boomslangs to be venomous?
What about a platypus?
How about moles, shrews, and solenodon?

Lets look at the definition of the word venomous.

ven·om·ous
adj \ˈven-ə-məs\

Definition of VENOMOUS
1

: poisonous

2

: having a venom-producing gland and able to inflict a poisoned wound.