Both are real, and the difference matters more than the label.
The single-deal version is what people usually mean by crowdfunding. You put money into one specific property with one specific sponsor, you can read that property's numbers, and you decide yes or no on that deal. Minimums are higher, often $10,000 to $25,000, and many of these are open only to accredited investors, which is a legal category based on income or net worth that a professional can confirm you meet.
The fund version pools your money and the platform decides which properties it buys. Some of these are structured as non-traded REITs, which is where your other forum got its comment. You're buying a slice of a portfolio rather than picking deals. Minimums can be very low, sometimes under $100.
On diversification: $500 in a fund holding many properties does spread your property risk, and you have not spread your sponsor and platform risk, because one manager is making every decision and one platform holds the relationship. That's a real concentration even though the underlying real estate looks diversified.
The thing to check before either one is liquidity. Both types tie money up. Funds often have redemption programs, which means you can request your money back on a schedule, and those programs can be suspended when a lot of people ask at once. Single deals typically have no exit at all until the property sells, commonly two to seven years out. If you're parking capital between land purchases, read the redemption terms carefully, because "park" and "locked for four years" are not compatible.