Yes...
I've bought two amps from him and both shipped within 4-5 weeks, as promised. I don't recall that he specifed a date, or number of days/weeks - I seem to recall he indicated "about 4 weeks," or something similar. I checked back with him in "about 4 weeks," or whatever the scheduled timeframe was... and he responded refining the scheduled delivery timeframe, which he met. But... it was within that general timeframe. I also recall, that I changed my order specs in the middle of the timeframe, and he adjusted the timeframe accordingly. But... always... communicated clear expectations.
Always returns my emails within 24-48 hours - usually in evening.
I'd be very surprised if he didn't ship when scheduled, or failed to return emails within 48 hours. That would be highly unusual.
Though... with the increased interest in his amps, the scheduled delivery timeframes may have extended beyond 4-5 weeks, especially, if you change your order.
In addition to quality products, his hallmark, has always been great communications.
If you're experience is different - there must be some extenuating circumstances.