Impermanent loss is very minimal on token like BFG that price moves in sideways for almost a month. Yes farming is good because it gives sure profit but the difference in APY between farming and liquidity mining is much larger so liquidity farming is still profitable rather than farming if we can based on the current price behavior of BFG tokens. Actually impermanent loss is not actually loss to the initial investment, You just missed the opportunity from gains when the token price pump which will be covered by the passive reward of the liquidity pool.
The difference in price between farming and liquidity mining is more than advantages of liquidity mining over farming. BFG tokens are on the way up, but they're still docked with a lower valuation. While it's really hard to predict whether tokens would go even higher, I think this project deserves a closer look at how it works. The token itself is not worth what you paid for it, but similar projects can wind up being worth much more than they were originally.