ETA: huh, sorry, this seems to have turned into something more like a blog entry than a brief self-correction.
Obvious editing errors in the last paragraph - fixes italicized: "If Earth has an order of magnitude smaller perihelion precession ... Earth's orbit". The first fix was meant to echo the parent's wording:
"And the effect exists and is known for the other
planets now; the mass increase is proportional to
velocity-squared and the velocity difference depends
on the eccentricity of the orbit, so it's an order of
magnitude smaller for Earth, but still measurable and
now known"
With regard to that, here is a table of exactly and approximately solved perihelion advances of all eight planets and Pluto: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9635960/table/t...>. [Sourced from an interesting (but as yet uncited, and weirdly published in TSWJ which let through some minor typos like "elliptik") paper in the category of "the expansion of the universe does not affect solar system orbits": https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9635960/> [*]].
Worth noting that Mars's orbit is highly eccentric at 0.0934, and its eccentricity is growing (as is Mercury's). Venus's orbit is much less eccentric at 0.0068. (Greater precision and eccentricities of the other planets can be found at https://calgary.rasc.ca/orbits.htm>).
[*] Taking the geometric mean across significantly different calculated values of the cosmological constant using their method (which I have no problem with) is to me a mathematical trick too far. That averaging does arrive at the conventional order of magnitude of \Lambda in m^-s, but I wonder if that's coincidence. The first author is essentially a mathematician https://orcid.org/0000-0001-9343-6062>, and whether the metric for the solar system must have a \Lambda term is much more a physical argument.
On that front, perhaps the authors should have cited another Iorio paper along with their [10], namely "Can solar system observations tell us something about the cosmological constant?" (2006) https://scholar.google.com/citations?view_op=view_citation&h...> although tbf Iorio cites his earlier and more popular paper in [10].