Google drive api does not sync immediately, That is why the deleted folders are still showing, so you have to force google drive to sync using requestSync()

A sample snippet

    private MetadataBuffer getGoogleFolders(){

        Drive.DriveApi.requestSync(mGoogleApiClient).await(); //Asynchronous request 

        CustomPropertyKey customPropertyKey = new CustomPropertyKey("App", CustomPropertyKey.PRIVATE);

        Query query = new Query.Builder().addFilter(Filters.and(
                Filters.eq(SearchableField.TITLE, "My folder"),
                Filters.eq(SearchableField.TRASHED, false),
                Filters.eq(customPropertyKey, "sampleApp"))).build();

        DriveApi.MetadataBufferResult foldersResult = Drive.DriveApi.query(mGoogleApiClient, query).await();

        if (!foldersResult.getStatus().isSuccess()) {
            Log.i(TAG,"Problem while retrieving results");
            return null;
        }

        MetadataBuffer result = foldersResult.getMetadataBuffer();

        Log.i(TAG, "total result " +  result.getCount());
        
        return result;
    }

OR

//Synchronous request 
Drive.DriveApi.requestSync(mClient).setResultCallback(new ResultCallback<Status>() {
            @Override
            public void onResult(@NonNull Status status) {

                //search query performs here 

            }
        });