I think that number is wrong. At the time of Hashpoint introduction, after Zenpool payouts crashed you could still get ~0.0002 BTC per MH/s after fees, i.e. 0.07-0.08 USD (BTC was at $350-400 then). Instead you were given 20 HP i.e. 0.05 XPY. So the breakeven point should be 0.07 / 0.05 = $1.40.
I was just quickly estimating in my head, and I went with .0001 BTC per MH/s just from memory, which is probably wrong. I was also assuming that the proceeds were kept in BTC, so I was using BTC current value. (.0001 * 240) / .05 < .5.
I definitely trust your estimate of .0002 BTC per MH/s more, as mine was just from recollection.