A disclosure of sorts, she is married to the Adox CEO, so there might be a little bias, no? Not saying there is or there isn't, just saying...
You can be relaxed concerning this topic. I've talked to her, know her approach. Her "big love" in photography is making BW prints. And she has not been much into using reversal film in the past.
But when she tried the SCALA films and the new kit, she was very surprised by the results. Positively surprised, she really likes the results. It is a very different look and different, unique character of BW slides. And a very nice addition to BW prints.
If she would not like the results, she would not have made this video. Definitely. If you look at her other videos, they are all exclusively about methods and products she has intensively tested by herself, and which she is using by herself because she is satisfied by the results.
Her youtube channel is a hobby for her. Not her income source. With such a small channel (in youtube terms) the work you are putting into such a review video is costing you much, much more then the few Cents you may get from youtoube (via their general advertizing income programme). There are lots of articles, reports and also youtube videos about the topic "making money via youtube". Therefore it is quite transparent and easy to see how much subscribers and regular followers and clicks you need to generate a noteworthy income by a youtube channel (and having at least a kind of compensation for your work you have put into your videos). And it is really a lot that you need, in the higher 6-digit number area before it starts to be interesting.
Best regards,
Henning