Yeah that's the deal, 4 hours in person instruction. If there is an online portion to it it hasn't come up yet,
The online is the annual refresher certificate part. Takes about 20-30 minutes.
Is there any component of armed defensive tactics?
If, by "armed," you mean throw your Bible and a Starbucks coffee at a guy with an assault rifle while he is shooting at you, then yes, you can be armed to the teeth in an ALICE program.
In all seriousness, actual resistance to an attack-the "C" (combat)-in ALICE is entirely disarmed and it is taught as an absolute last possible course of action to be undertaken only if no other course of action is possible. You will learn how to "bum rush" the attacker with as many people as possible and try to get at least five defenders to make actual physical contact with the attacker-one defender grabbing each of the attacker's limbs and one grabbing the attacker's head, thereby tackling him and pinning him to the ground. They even teach to not pick up the gun no matter what. So, yeah, they're kind of assuming you have far more than five defenders and at least five will make it through the hail of bullets, while everyone else takes one for the team-quite literally. The other aspect of the combat portion is make shift weapons. (furniture, books, whatever is available.)
The majority of the course is about escaping/evading (The "E" in ALICE) whenever possible, and how to use whatever is available, or pre-staging materials, to barricade (the L in ALICE-lockdown) in place. For examply, i now keep the biggest (75 lb tensile strength) zip ties I could buy in my office. They go around the door closer at the top of the door which prevents the door from opening. I purposely staged a book case full of reference books immediately adjacent to my door to block that door. I also learned to mark "sight lines" in my office such that one can readily see "blind spots" where, if the attacker is at a window or door, you know where he can't see, and you're out of the direct line of fire.
Honestly, to people like you and I-in other words, people who live an armed lifestyle, or at least are armed defenders, people who know about situational awareness, the ooda loop, Jeff Cooper's color codes, etc etc...the ALICE course is extremely low level. (In fact, IIRC, they added OODA and the color codes to the refresher last year.)