I don't think he intended to imply that haste affected proc rate, rather that with haste even while affected by damage cap that the proc helps to offset things.
140dd adds close to 2.5 sustained dps for every proc per minute. At low levels where you're only parsing (at best) 15-20 dps with Wurmslayer + a good offhand, 2.5-5 dps from a proc adds up pretty well.
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