Fitness is a slightly misleading term here and not meant to be taken literally - but used because Chronic Training Load is copyrighted.
It’s worth looking at the Form line here (which is your 6 week training load less the training load over the past week) to assess your current capabilities, which has jumped up sharply, representing your longer term training, but with the deloading of training stress over the past week.
The Performance Management Chart which Elevate presents is not intended to be a literal fitness measure, but a guide as to how much training stress your body can take, based on recent training history.