They had to automate from Airtable to post in your social profiles somehow. I don't think they were able to do this using Airtable automations (but you can check by clicking "Automations" tab at top of page while viewing the base).
I imagine they used Zapier or Make to automate the process. They must have owned these accounts if you are unfamiliar with them, so you wouldn't be able to access them now.
You'll have to set up new automations in order to make the table function again and reuse the content.
I've made a lot of Zapier/Airtable automations before and I'd be happy to talk you through what you'd need, or create them for you. You can schedule an initial call with me here .