Are these Pods Ob-sec?

[son_of_volmer]

There's an enormous formation in Shield of Baal Exterminatus called Dante's Avenging Host. One of the benefits is that All Non-Vehicle models gain objective secured.

If you take a drop pod as a dedicate transport for a tactical squad, does it gain objective secured?

[Charon]

Non-Vehicle models

should give a hint. It is not tied to the force organisation (they would still be considered troops for scenario specific rules for example) but on a model by model base. And the Drop pod model is a vehicle.