Are you sure Awesome miner is using nethash average to calculate profit? I havnt used it much and havnt check but i have an app which basically do the same thing to show mi the profit of coins which are not listed on WTM, first i was trying to use the average nethash for 24h and the value was totally unusable. Then I changed to collect the difficulty and use a formula to calculate the profit and this was way more accurate and gave me the same estimates as WTM.
Is your question does Awesome Miner use nethash or does this plugin use nethash?
Awesome miner uses the profitability which the pools provide.
I believe this plugin uses the nethash to calculate rewards and then uses exchange rates to calculate profitability.