That's why it was claimed you were repeating one of the mistake of Dingle, because you were focusing on the term $$\frac{\partial \Delta t'}{\partial \Delta t} = \frac{1}{\sqrt{1 - \frac{v^2}{c^2}}}$$ when the Lorentz transform is more than that, it's $$\Delta t' = \frac{\Delta t - \frac{v}{c^2}\Delta x}{\sqrt{1 - \frac{v^2}{c^2}}}$$.
This is the same mistake as claiming a rotation left by 30 degrees isn't canceled by a rotation right by 30 degrees because $$\cos \, 30^{\circ} = \cos \, -30^{\circ} = \frac{\sqrt{3}}{2}$$ when the relevant expression is $$\begin{pmatrix} \cos \, 30 ^{\circ} & \quad & - \sin \, 30^{\circ} \\ \sin \, 30^{\circ} & \quad & \cos \, 30^{\circ} \end{pmatrix} \begin{pmatrix} \cos \, -30 ^{\circ} & \quad & - \sin \, -30^{\circ} \\ \sin \, -30^{\circ} & \quad & \cos \, -30^{\circ} \end{pmatrix} = \begin{pmatrix} \frac{\sqrt{3}}{2} & \quad & - \frac{1}{2} \\ \frac{1}{2} & \quad & \frac{\sqrt{3}}{2} \end{pmatrix} \begin{pmatrix} \frac{\sqrt{3}}{2} & \quad & \frac{1}{2} \\ -\frac{1}{2} & \quad & \frac{\sqrt{3}}{2} \end{pmatrix} = \begin{pmatrix} \frac{\sqrt{3}}{2} \frac{\sqrt{3}}{2} + \frac{1}{2}\frac{1}{2} & \quad & \frac{\sqrt{3}}{2} \frac{1}{2} - \frac{\sqrt{3}}{2}\frac{1}{2} \\ \frac{\sqrt{3}}{2} \frac{1}{2} - \frac{\sqrt{3}}{2}\frac{1}{2} & \quad & \frac{\sqrt{3}}{2} \frac{\sqrt{3}}{2} + \frac{1}{2}\frac{1}{2} \end{pmatrix} = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix} $$
So you criticize relativity because you don't understand relativity.
And you don't understand relativity because, at a minimum, you don't understand the mathematics of the Lorentz transform.
Specifically, you don't understand that a Lorentz transform of v is canceled by a Lorentz transform of -v (in the same direction).