It is the same ending as in the original animated series. The fifth movie had more or less the same story, where Ataru never says that he "loves her", but is also holding on to her horns. It also follows, with some minor alterations, the original manga by Takahashi. So, yes, this is the canon ending.
Beautiful analysis, especially about the Ataru and Lum relationship.
what a beautiful show
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Is it the actual canon ending or what?
It is the same ending as in the original animated series. The fifth movie had more or less the same story, where Ataru never says that he "loves her", but is also holding on to her horns. It also follows, with some minor alterations, the original manga by Takahashi. So, yes, this is the canon ending.