You are wrong. These were recorded after Dizzy's tenure on those labels. That Mosaic set contained:
Album index
Norgran MGN 1050 Diz and Getz
Norgran MGN 1083 Dizzy Gillespie and His Orchestra
Verve MGV-8141 Diz and Getz
Verve MGV-8173 Jazz Recital
Verve VS-68313 Have Trumpet, Will Excite
Verve VS-68328 The Ebullient Mr. Gillespie
Verve MGV-8352 The Greatest Trumpet of Them All
Verve MGV8386 A Portrait of Duke Ellington
Verve VS-68401 An Electrifying Evening With
Philips PHS600-048 Dizzy on the French Riviera
Philips PHS600-070 New Wave!
Philips PHS600-091 Something Old, Something New
Philips PHS600-106 Dizzy Gillespie & the Double Six of Paris
Philips PHS600-123 Dizzy Goes Hollywood
Philips PHS600-138 Original Score from the Cool World
Verve CD 314 521 857-2 Johnny Hodges - Jazz Master