Facebook – Does Facebook Block IFTTT Backup Recipes?

No, it's not the same as Hangouts. Gtalk is more or less replaced by Hangouts. The IFTTT channel was quite limited in any case, but it won't work with Hangouts at all.

For an IFTTT recipe, you need a trigger and action.

In your case, your Action is to post a Facebook status. Fortunately, the Facebook channel has a Post Status action available.

Your Trigger is a specific date/time. You want to use the Date & Time channel for your trigger.

Create a new recipe and...

...for This select the Date & Time channel and choose the appropriate trigger. These triggers are designed to be recurring triggers, but one presumes that you'll delete the recipe once the status is posted. (I'd choose the "Every year on" trigger.)

...for That select the Facebook channel and choose the appropriate action, which as we've established is "Create a status message". Add the text of the status message you want.

That's all you need.

If you prefer, you can take this recipe, which is currently for posting a "Happy New Year" status, and modify it to your needs.