I disagree. Outside of these boards, many people aren't interested in traveling anywhere right now. A lot of people also don't have the money to travel. Demand for any amusement park is non existent.
I can only speak to the situation with people I know. Based on friends and colleagues, and from speaking to a realtor who serves that population, a lot of people who have not financially suffered as a result of COVID have instead made large investments into "safe" and "secure" forms of relaxation. Instead of planned international vacations or high-expenditure Disney trips (CL, VIP tours, deluxe dining plans), the purchasing lake houses, several people we know have bought "luxury" motor homes (and used them to tour national parks); people who didn't already have a pool are building resort-style pools,...
Additionally, a lot of these people were not infrequent visitors of WDW, but had neither the interest or time to devote to learning the ins and outs of planning a Disney trip - they'd hire a TA to plan everything (or completely turn the reigns over to someone else they trusted). They'll see ads but won't seek out information themselves. I can't count the number of colleagues I spoke to who just wanted to go to WDW and not have to worry about ANY planning. Even trying to help them pick a resort was a chore - as soon as they'd hear about the number of deluxe resorts and how they all have different themes, their eyes glossed over and they just wanted to be put in "the nicest one" (which I guess makes sense considering normal living conditions). (And these aren't people doing it for social media purposes.)
Obviously repeat visitors did become somewhat familiar with FP+, etc. However, there is now a mix of those who don't know about any of the changes in protocol/procedure Disney has made as a result of COVID (and in turn don't know how safe or unsafe the parks may be), and those who have heard bits and pieces about these changes and felt exhausted at the idea of relearning things. They're also tied up with the large new expenditures (lake houses, boats, pools).
I think there are a host of reasons (financial, quarantine requirements, masks, caution and/or fear, reduced experiences (entertainment, resorts, restaurants), etc) why a lot of people aren't going to WDW right now. (And I'd guess they for most people, it's a combination of reasons.) I just know that among people I know, many are still traveling, they're just buying expensive motor homes and going to national parks. I also think wider advertising would help (maybe targeted advertising?), but as many have mentioned, that would probably get a lot of bad press.