The claim is likely true. The strongest available evidence in this run is two independently fetched reports — PANews and CoinPost — both published on 2026-04-16 and both attributing substantially the same quote to Grant Cardone's X post: that he had purchased 500 properties in prime locations and would buy an additional 400 Bitcoin. PANews explicitly links the statement to the X post https://x.com/GrantCardone/status/2044617813776593072. Although the X post itself could not be fetched successfully in this run, the two fetched articles are consistent with each other on the key facts and wording. CoinDesk's earlier interview, "Grant Cardone Wants to Use Real Estate Cash Flow to Buy Bitcoin. Here’s How," independently confirms that Cardone had already been publicly pursuing a strategy of buying bitcoin using real-estate cash flow, which aligns with and strengthens the plausibility of the reported 400 BTC plan. No fetched source in this run contradicted the statement.