Let see the details of the curve; Let $K = \operatorname{GF}(3^m)$ and the curve be defined by the equation  $$E(K):y^2 = x^3 + 2x + 1 \quad\quad ;-1 \equiv 2 \bmod 3$$

1. Yes, it is supersingular
2. The group of rational points has order $$n = 19088056323407827075424725586944833310200239047$$
  The order has two factors; $7 \cdot 2726865189058261010774960798134976187171462721$.
 
   The second factor ( large one) is $\approx$ 150-bit number.

4. The generic DLog attack requires $\sqrt{n}$-time, so the security of the curve cannot be larger than $2^75$. Therefore cannot be used securely for ECDH. 

   In today's standards, we at least require 128-bit security. That is why the Curve25519 is preferable, with some other properties like twist security  

5. It has no [twist security][1] at all. The twist has an order $19088056323407827075424246988286372075141058881$ and it has two large factors $(9594160501626613625431,1989549405617260510054951)$, (approx each is a 73-bit number) therefore no twist security.

6. Curve that uses binary extension field $\operatorname{GF}(2^m)$ are effective in the calculation, however, [some binary extension has no longer secure effective sizes][2]. Using 3 as a base field is harder to use a large field like Curve25519.

7. According to the current NIST curves, it has lower security, though some of them don't twist security.


---- 

SageMath code

    K = GF(3^97)
    print(K)
    E = EllipticCurve(K,[0,0,0,-1,1])
    print(E)
    print("singular? : ", E.is_supersingular())
    print("Order of E : ",E.order())
    print("Factors of ord(E) : ", factor(E.order()))
    E2 = E.quadratic_twist()
    print("Quadratic Twist of E :",E2)
    print("Order of Quadratic Twist :", E2.order() )
    print("Factors of the order of Quadratic Twist :", factor(E2.order()) )


  [1]: https://safecurves.cr.yp.to/twist.html
  [2]: https://crypto.stackexchange.com/q/83336/18298