No it can very possibely be true but that is because they don't say 400% of what time...
Test like all hormones in the body fluctuates during the day (Morning is commonly peak level --> Why the uncontrolable morning-erections!!

)
So it may very well boost it for 400% during a "low" level, not only that but they don't state changes in SHBG, Estron/Estrogen, Progesterone, T4, HGH etc.
Why drugs like Bromocriptine have different actions for different intervals taken per day...
And don't mention for what timespan!!
And if the mice might already been natural "low-test" mise
Just to mention a few manipulative aspects...
You see my friends --> Withdrawing/leaving out info can very well make any product look good and promising
Greets
Kingofmasters