That's only true if the Jazz renounce all their own free agents, including Gordo and Marvin, and release the players on unguaranteed contracts.
Projected Salary Cap: $63.2mm
6 guaranteed contracts + 6 minimum roster charges: $30.2mm = $33mm cap space
6 guaranteed contracts + Gordo's cap hold + 5 minimum roster charges: $38.3mm = 24.9mm cap space
6 guaranteed contracts + Marv's cap hold + 5 minimum roster charges: $40.9mm = $22.3mm cap space
6 guaranteed contracts + Gordo and Marv's cap holds + 4 minimum roster charges: $49.1mm = $14.1mm cap space
Guaranteed contracts: Favors, Kanter, Burke, Burks, Evans, Gobert = $27,149,862
Gordo's cap hold: $8,630,458
Marv's cap hold: $11,250,000
Minimum roster charge: $507,336
Unguaranteed contracts (not included above): Lucas, Garrett, Thomas, Clark