He can't separate Valentina as kickboxer and muay thai fighter from her as mma fighter. She is great kickboxer and muay thai fighter but her whole skill didn't transfer to mma (her career is decent so far). You could make many many examples like:
-Rakoczy, very good female boxer, very bad mma career;
- Tiffany van Soest, very good kickboxer, not really good mma career;
- Amanda Kelly, decent kicboxer with good record and wins ( Julie Kitchen, Joanna Jedrzejczyk), very bad mma career;
- Jorina Baars, very good thai boxer, murked Cyborg, but in mma she was destroyed by pregnant Cindy Dandois;
With fighters like Holm or Jedrzejczyk, people think that being very good kickboxer/boxer will automaticlly transfer too mma. No it won't.
Jedrzejczyk was part of best polish mma gym since 2010 and she started to train wrestling around that time (that's why she is very good wrestler,that's why she got submission finishes in her first fights, but coaches decided to stick to her superior skills), Holm's debuted as mma fighter 2011 so 6 years ago and I'm not sure but also was part of mma gym. So both worked their asses focused few years on mma, before their sucesses. Maybe both are on decline right now (because of age like Holly, or being battleworn like Joanna, she has crazy amount of fights in her career) maybe not, but fact they were UFC champions was not some luck.
On other side you got Valentina and she was competing in muay thai 2nd half of 2015,when both Holly, and Joanna were champions. So she 100% focused on mma not even 2 years...still great she was able to fight for belt, but that's it. She has a lot to prove and you will see how other figthers will exploit her weakness every fight. Nunes already did it.