Tesla relies on high volume to make money; the other automakers are pricing EVs based more on margin. An economic slow down hurts volume much more than it hurts margins.

Tesla also relies heavily on first-mover advantage to grow. With the virus stalling everything, all the more cash rich automakers get time to catch up on R&D, while Tesla is stalled from being unable to physically expand. Tesla also becomes more cash starved from falling stock prices than other automakers.

Then there's the drop in gasoline prices which naturally makes Tesla much less cost competitive vs ICE vehicles in its major markets (US/China). Added bonus of traditional automakers benefiting from low gasoline prices because historically consumers buy higher margin vehicles (truck/SUVs) when gas prices are low.

So it's multiple various disadvantages hitting Tesla all at once that's likely to continue for a couple of years.