True, it needs to be a safe prime, but not all 2048-bit safe primes are equally good. At the very least there are those for which the Special Number Field Sieve

True, it needs to be a safe prime, but not all 2048-bit safe primes are equally good. At the very least there are those for which the Special Number Field Sieve applies, though that's likely still infeasible. There might be very rare 2048-bit DH groups using safe primes for which the DLP problem is easily solvable, I wasn't able to find any research into whether or not those can exist.