As all the bodily forms we take are temporary, does that mean the eternal and real is formlessness?

From Ravikumar Shukla

Someone might argue that, after death, we also leave our present form, and may get another form, lets say a form of a dolphin.
That means our present form is not real, similarly the next form of dolphin is also not real, since it will get destroyed by time factor.

Now, can someone say that forms are not real because they get destroyed by time, but we are real because we don’t get destroyed and hence we are truth.
For substantiating the above point, this people take the support of Srimad Bhagvad Gita, chapter-2, verse-16.

In which they claim that,
that which is false is always destroyed (forms)
And that which is true is never destroyed (soul)

Hence they conclude by saying that , soul is formless

How to understand this with Gaudiya Vaishnav commentaries in a better manner.please suggest