No clue what you are meaning by transitory, but Matt is definitely singing at the top of his (non super head/throaty falsetto) range in much of this. If you mean that it doesn't sound like its coming from his diaphragm then you are probably correct. He does that in his lower, thus fuller notes in this clip.
Sounds good! I obviously look forward to hearing full songs hehe. And I do think your voice continues to improve.