They're two different products, and the form you saw is the tell.
The $2,500 one is a public non-traded REIT. It's registered with the SEC, files audited financial statements and periodic reports, and can be sold to any investor. That's why nobody asked about your income. Minimums in that world commonly start around $2,500, sometimes lower on platforms, and you'll often see it offered through a financial advisor or an online investment platform.
The one asking you to certify $1M in net worth excluding your primary residence is a private non-traded REIT, sold under an exemption from registration. Because it isn't registered, the rules limit who can buy it, which is where the accredited investor tests come in. Net worth over $1M excluding the primary home, or income thresholds, are the common ones, and there are other qualifying paths. Minimums there run much higher, $25,000 and $50,000 are ordinary, and some are far above that. Confirm the current thresholds and how they apply to you with a licensed professional, since the definitions do get updated.
You don't need a license to invest in either. Licensing applies to the people selling them.
So the meetup comment was half right. Accreditation is required for the private, unregistered offerings. It isn't required for registered non-traded REITs, and that distinction is the single most useful thing to hold onto in this room.
One more practical point since you're comparing two offerings. The registered one gives you audited financials and mandated disclosure you can read for free before investing. With the private one you're often relying on a private placement memorandum and whatever the sponsor chooses to share. Less paperwork to read is not the same as less risk.