  The recent data release by the Planck satellite collaboration presents a
renewed challenge for modified theories of gravitation. Such theories must be
capable of reproducing the observed angular power spectrum of the cosmic
microwave background radiation. For modified theories of gravity, an added
challenge lies with the fact that standard computational tools do not readily
accommodate the features of a theory with a variable gravitational coupling
coefficient. An alternative is to use less accurate but more easily modifiable
semianalytical approximations to reproduce at least the qualitative features of
the angular power spectrum. We extend a calculation that was used previously to
demonstrate compatibility between the Scalar-Tensor-Vector-Gravity (STVG)
theory, also known by the acronym MOG, and data from the Wilkinson Microwave
Anisotropy Probe (WMAP) to show consistency between the theory and the newly
released Planck 2018 data. We find that within the limits of this
approximation, the theory accurately reproduces the features of the angular
power spectrum.
