You are absolutely right. Impermanent loss can only be totally avoided if the token goes up then down. However everything depends on what you want achieve. In my illustration there were 3 possibilities:

1. Continue owning ETH
2. Convert ETH to GET, earn fees, put it in the pool, and risk being converted back to more ETH than in 1
3. Convert to ETH to GET and keep the GET (no pool), and earn no fees.

Any one of the 3 might turn out to have been the most attractive.

I chose objective 2 as I was doing this for the purpose of the article. Clearly option 3 is the best based on my bullish view of Get. I have that covered elsewhere.