"My unders haven't been great this year."
Many bettors will read that sentence then just go on to the next sentence without seeing the unstated counsel, without seeing what it is - the best advice you're going to get today.
Most people researching a total will spend time looking at the over-under record of both teams, but many won't take a second to look at their own record for totals - because many bettors don't know their own record.
Don't just handicapped the game, handicap the handicapper - know yourself, track yourself, and your play. And adjust your bets accordingly.
I'm all about helping bettors with advice, and this is excellent advice he's giving because it has long-term benefits, it's that whole, "Give a man a fish/teach a man to fish" thing. That sentence about unders is more valuable than any winning pick because a winning pick helps you today, the advice delivered with that sentence will help you every day.