They don't sell to consumers; they aren't going to build a retrofit for a LEAF.
And it's a 6 year old video. The link in the description to their website gives a 404.
But sure, email them if it makes you happy.
ICE free since '18 / 100K+ 100% BEV miles since '14
LEAF '13 SL (mfg 12/13, leased 4/14, bought 5/17, sold 11/18, 34K mi, AHr 58, SOH 87%)
Tesla S 75D (3/17, 46K mi)
Tesla X 100D (12/18, 25K mi)
8.9kW Solar PV and 2x Powerwall