Exactly. They increased their market share - but they reduced their prices to do it. Nearly all companies have that option. That’s why demand curves slope downward. If you reduce your prices, you can sell a larger quantity. If you make more product, you have to reduce prices to sell the extra quantity (other things being equal). That is the common state for most companies.
That doesn’t mean they have material unmet demand at current prices, or that their current prices are set higher than the market-clearing price (which would show up in excessively high margins). If they had significant unmet demand at then-current prices, they could have just sold more cars without lowering prices. Given that Tesla has adjusted their prices (ie. lowered them) at times to clear demand, their current wait times for vehicles in Europe aren’t especially long, and that their most recent profit margins were in line with what industry leaders have routinely achieved without subsidies, it’s less likely now that there is significant unmet demand for the Model Y.
Again, it’s only one quarter. Maybe Tesla’s margins will spike up again to be sufficiently higher than the subsidies to indicate unmet demand for the Y at current pricing. We’ll have to see. But there’s not much in the market data to suggest that Tesla could significantly increase the size of the Euro BEV market at their current prices just by pumping up their output.