For a major news organization like Bloomberg to run that number, their standard practice is to tell Disney what they're going to say and offer a chance to rebut or deny it. And Bloomberg told me that's what they were going to do.
Bloomberg would not quote me, some random guy on the internet, if Disney disputed the number.
The reason they reached out to you is because Disney won't talk about attendance.
Bloomburg decided that you are a credible enough source to speak about it. Any fact-checking would be to ensure you are who you say you are and raise any red flags about your credibility.
In the absence of hard data from the source, you look like the next best thing. The 15% number is attributed to you, and that's it. Readers will have to decide for themselves if you are credible enough to speak to it. Because Bloomberg quoted you, it adds to your credibility. Other news organizations may reach out to you. You could be quoted more often.
For stories like this, Bloomberg certainly could reach out to Disney for comment or ask about your 15% number, but the response will be just as it says in the story:
"Disney doesn’t share specific numbers on park attendance."
At these large corporations, the people the reporter would be talking to would not have the attendance information. This is designed to keep proprietary and confidential financial information from leaking out. The flow of information must be controlled.
If the reporter was lucky enough to land an interview with a Disney executive who does have information about it, they could ask, but those executives are well-coached as to what to say. In addition, people from the company media team will likely be there to remind executives what they can and cannot say.
Public companies take great care in the information they release. Billions of dollars are at stake. They have to correctly follow procedures.
Every quarter, Disney reports on its financial performance. Its executives will answer questions, but they set limits. As the story says, earnings didn't meet expectations because of "underperformance," but no specific percentages on a dip in attendance are likely to ever be revealed.
Sometimes companies will say business is "soft" or didn't "meet expectations" or there are "headwinds" or some other corporate-speak.
What really matters is the bottom line and what they are doing to keep revenue and profits growing to satisfy stockholders. Park attendance may go up or down, but the bottom line needs to always be heading in the right direction.