Hearing Hezbollah putting out a call for fighters indicates to me that they are in big trouble.
May their big trouble continue...and worsen.
Clearly Israel has degraded Hezbollah's lines of communication, meaning that consumable materials will soon or eventually dry up. Outside of a large stockpile of rockets, I've seen no indications of other stockpiles of materials necessary to support offensive actions, but this doesn't mean that they do not exist.
Hezbollah may be attempting to make up in numbers what they cannot obtain logistically, for an offensive, to maintain a credible defense, or to maintain survival levels.
From a strategic point of view, manpower is a consumable resource during combat operations. I consider it unlikely that Israel has made significant inroads into Hezbollah troop strength, typically infantry dig in during airstrikes and emerge when the planes leave. My guess is that Hezbollah is calling for men as a contingency, in case future Israeli maneuvers include a ground assault.