In general, you could use eval status=if(count>threshold,"False","True") .
However , it looks like you have multi value fields from your stats and guess you are using list(field). If you have only one value per row based on your by clause, you may use stats first(field) as field . But it's purely based on your current search and would be helpful if you could share it.
If you still need multivalue fields, you may extract the first element for threshold and count as eval threshold=mvindex(threshold,0) , count =mvindex(count ,0) and compare them as mentioned above.