Mario has done them since Super Mario 64. You should know. 
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Since DK 94
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I don't know how I forgot that. It was one of my favorite Game Boy games.

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Those were the games I was going to mention. His ability to do the monkey bars is new, though.
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forgot he could do that in the game on the left.
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Ah...
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i mean. he's done backflips since the 64.

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those look like forward flips in both directions
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The last 3 flips are backflips.
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Look’s like Mario is training to flip of backs now.
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um he's been backflipping since 64
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He's been doing backflips since Mario 64...
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he did backflips in Super Mario Galaxy
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And in Super Mario 64 and Donkey Kong 94
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exactly
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