Bullocks. For starters, the AD&D 1e PHB did not contain the to-hit charts for combat, which were essential to play. In point of fact, since the very beginning the rules for AD&D have been split across three books. An alternate PHB can, therefore, be considered to be a. . . er. . . PHB. The PHB is not — and never has been — the whole game.
Apparently TSR didn't consider the other books too important since the original PHB came out in 1977 and the DMG wasn't out till 1978. 2E had all the needed info. 3E and 4E have all the needed info, 4E especially, since magic items are even in the PHB. The PHB has always been what the players need to play the game.
Wikipedia didn't have a month of release for the 1E DMG, but here is the publication order for 1E. The mantra we always hear, and we heard all thru 3E as well, was that the PHB was all you really needed to play. There is a reason the alternate PHBs contained so many of the same rules. If you weren't using the d20 logo (which required the "Requires the PHB, DMG, MM" or whatever that exact text was), you had to have the complete info or else you were just making more books.
1977 Monster Manual
June 1978 PHB
1979 DMG
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