no I wouldnt, we have never seen six month prepped rock lack bacteria. we have seen ten thousand examples though of two non seneye test kits disagreeing...i say wait till this one passes or fails before buying more bac.
it is not hard to get api to read as dark as it does on the main tank, in our example link JackAlexander's was the same, and was fixed with one water change, showing his original bac to be enough. his example link was one of the hundreds and hundreds of examples of api issues along with the countless reports of it showing .25 on most running tanks (which tan converts to .025/safe range even though its not hard yellow)
we dont expect reefs to run hard yellow on api, they're continually producing ammonia from bioload and its being converted, and over reported as .25 we can see in post patterns. on very few running reefs does api show hard zero.
I do believe thats accurate for the bucket though, clean water and zero bioload and literally only slicks on the rocks. very clean so far. you've arranged a nice clean concise test for sure. we can use both this current badge too on the test! try to include those pics if possible, when you add a few drops can the seachem badge pick it up too?
using the badge and the api on the bucket test is more range of feedback to compare on a water sample we truly agree is zero/hard yellow accurately. your badge is not necessarily wrong so far. it could just as easily be the api overreporting, plus your badge is applying TAN conversion and the tube is not, so it will read higher by rule. ten times higher than the badge. digital testers report the actual number an extra decimal out= .00x but getting to hundredths via titration is still good and accurate and decent as a reference for api.
**api isn't being made out the villain here

when it shows .25 on a running reef, no TAN conversion, that's .025 TAN and that's not toxic, its safe. They're decent when calibrated.