I agree with you, there is certainly a sick period with cigars.
it was the reference to ammonia that was the basis of the statement.
CCs used to be horrible until the initial freshness of under cured tobacco went away, I have had many boxes like this.
Since 2003 or so ,CCs have been rolled with more aged tobacco.
Not really old, but enough to get past the ammonia stage.
The only recent CCs I have encountered with any ammonia in them have been fresh custom or farm rolls.