  We propose that the recently observed superconductor-insulator transition
(SIT) in the twisted bilayer transition metal dichalcogenides moir\'{e} system
at hole filling $\nu = 1$ may be described by the deconfined quantum critical
point (DQCP), which was originally proposed for the transition between the
N\'{e}el order and the valence bond solid (VBS) order on the square lattice.
The key symmetries involved in the original DQCP include a $\mathrm{SO}(3)_s$
spin symmetry, as well as a $C_4$ lattice rotation symmetry for the VBS order
that is enlarged into a $\mathrm{U}(1)_v$ symmetry near the DQCP. In the
current SIT under consideration, the counterpart of the $\mathrm{SO}(3)_s$ spin
symmetry is an approximate $\mathrm{SO}(3)_v$ symmetry that transforms between
different crystalline orders on the triangular lattice; and the role of the
$\mathrm{U}(1)_v$ symmetry is replaced by the ordinary charge-$\mathrm{U}(1)_e$
symmetry. And at the DQCP the $\mathrm{SO}(3)_v \times \mathrm{U}(1)_e$ may
enlarge into an emergent $\mathrm{SO}(5)$ symmetry. Under strain, the SIT is
driven into either a prominent first order transition, or an "easy-plane" DQCP,
which is expected to have an emergent $\mathrm{O}(4)$ symmetry.
