He means that right after the season update a lot of players buy the good scout players, especially when your at the top of the server.
I have a team where an hour after the update there are only +25 year old, low quality scouts remaining on the list. The 22-24 year olds close to 7 stars are gone immediately.
Besides if you tank, the scout players you buy before the season ends have a little more time to train and they don't lose stars.