Canna Bio Boost?

Have any of you fellow growers used this right until harvest?

biocanna's website cultivaition schedule says to use bioboost by itself in the last 2 weeks, but they've had conflicting information on their website before...

Im thinking it should be okay to use as it has no nutes, if anything itll help the plant metabolise nutes already in the soil?

pay no attention to that shitty schedule m8 use until last week and a half then water only just to be sure