Weird, the UFAQ rulings for whispers are showing up in NRDB already, but I’m not seeing the page up on ANCUR yet.
At any rate, the entry for Laamb agrees with @Sanjay – Laamb sets up a trigger that is met when you encounter an ICE. This trigger allows you to pay 2 credits to give the ICE barrier. This is, like Femme, distinct from an icebreaker ability that interacts with the ICE (and requires strength to meet/exceed).
I believe it would require matching strength if the text was
2$: Give an ICE currently being encountered Barrier subtype
due to the rules reference text under “Icebreaker” on page 14:
The Runner uses icebreakers to interact with and break
subroutines on ice. An icebreaker can only interact with ice that
has equal or lower strength than the icebreaker
assuming that “interact with” includes “adding subtype” (which it might or might not, I don’t see a definition of “interact with” but it definitely includes breaking subs and definitely does not include boosting breaker strength).