Many have tried to recreate his results and failed and therefore claimed he is faking it. The videos look legit though.
The big magnet parameters: Diameter 45 mm, Height 30 mm, Material NdFeB, Surface (Ni-Cu-Ni), Magnetisation N50, Strength 98kg, Weight 360g.
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According to magcraft.com, as long as their physical properties remain intact, neodymium magnets will likely lose less than1% of their flux density over 100 years. Generally, the magnet will experience a degradation in its physical properties, such as corrosion, prior to it demagnetizing because of age.
Thank you for watching.