Graham
They are quite correct on both counts. As of last year, your government in the EU banned the sale of new 2stroke marine engines except for ‘commercial’ use.
The 2stroke is arguably more robust than the 4stroke in that it can be stored upside down if you like, making it better suited for chucking in the car and the bottom of the boat. You can only buy them second hand.
However.. It has been argued that the 4stroke may be more durable in a capsize situation for the very reason that it cannot be stored upside down – the oil in the sump drains into the cylinder and protects it.
David