Power Query: If (nested or second table) contains statement

Joe_JL 

That could be like this, our queries are

Lookup keep as it is.

In Main query add column with list of keywords by Text.Split() of Keywords field.

Reference Lookup and create Not Contains keeping only Result and Not Contain columns, unpivot the latest, Group by Result without aggregation keeping only Values column. Thus we have list of Not Contain words for each Result (if exists)

Similar for Contains

Merge both above to have both lists in one List Combined table

Reference Main query as Final, add above Lookup Combined table to new column here

and expand it. 

Add new custom column to check KeywordsList against Contains/Not Contains

Group by initial columns without aggregation keeping in resulting table of each group only rows where previous value is true.

Expand Result from it

and finally combine with Prediction

Details are in attached file.