Except you bloody haven't.
You showed Naruto completing the final steps to a seal he didn't even create. None of this disproves the notion that Naruto is weak with sealing techs. It's like somebody writing a college essay for Naruto and Naruto just clicking 'submit.' Minato layed the framework of that seal, not Naruto.
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Image above is evidence that Naruto still fails at sealing techs, despite having RSM. Naruto makes a rasengan using Shukaku's Chakra, and
Shukaku puts a sealing tech into it. Naruto had nothing to do with the sealing tech.