Well, authorities are investigating it as a possible terror attack, and apparently it had "fireworks-style mortars" inside so I suspect this wasn't a garden-variety Cybertruck malfunction.
consumer fireworks (1.4g) cannot blow up like this, by design and regulation. fire marshals can and do enforce this at points of sale & distribution
professional fireworks are also regulated to minimize mass-explosion risk.
if fireworks were involved in the explosion, it would necessarily be an improvised device. achieving this level of explosion with consumer fireworks would be difficult. the fireworks are a red herring, imo.
The videos show a large explosion but there isn't a single window at the front of the hotel that shows damage.