There's no way anyone here is going to know the details of how the vloggers got into the lounge. All that's known is what they themselves said, and that may not be the whole story. The vloggers themselves may not know the whole story. It's not unreasonable to think that word quietly went out to the CMs that these people were "influencers," and to let them go into the lounge and get some video.
Look, Disney bends its own rules every single day, if it suits them to do so. People get free room upgrades. People get let into private fireworks viewing areas, club lounges, pools they shouldn't have access to, backstage areas. People get meals comped, rooms comped, tickets comped. It happens because they're celebrities, or bring positive publicity to Disney, or are friends of executives, or are spending a ton of money, or will bring business to Disney, or are someone it benefits Disney to impress.
And it's not just Disney. It happens throughout the travel industry. If you're going to stress out over someone getting something you think they're not entitled to, or that you can't have or would have to pay for, you will make yourself miserable.