There are many more COCA citations for 'Has yet to' (3,200) than for 'is yet to' (400). However, for '... yet to come, the figures are 'has', 53; 'is', 180.
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"He has yet to receive the message."
This can also be understood as "He hasn't received the message yet."
Can it be understood as "He isn't received the message yet."?
That should clarify it for you.
MustAsk"The best is yet to come."
That is a different case. In "He has yet to come", "come" means "arrive". In "the best is yet to come", "come" is part of an expression, "yet to come", meaning "in the future". You can't just do blind samplings and expect valid results.