Are the reckoning effect Lore checks on Glamour cards considered spell effects?
Yes.

From the rules reference, page 11:


  An investigator can resolve a Spell card's effect as described on the
  card. A Spell card’s effect may be triggered by a specific event or
  require an action.


The rules don't explicitly define a "Spell Effect", so we use the above to determine that it means the effect of a Spell card, whether cast or activated otherwise.