The linked article mentioned (or at least implied) that for an orbit of 9.5 days, the planet would be too close to its primary and therefore too hot for its planetary gravity to hold light gasses like hydrogen and helium

Therefore this would be a rocky cored world of 13+ Me with up to 1 Me of heavier gases in a thick atmosphere.

Would this particular world have water at its surface?

- No way!

Surface temperature for a bare rock body orbiting a solar class star at 0.088 AU (the distance required for a 9.5 day orbit), is 877K

That's beyond the triple point of water at 647K. This planet would not be a giant Earth, but a giant Venus, with a hellish atmosphere.

[What is the limit for an orbit with stablle water? - very close to that for the Earth. About 0.9 AU is where atmospheric effects cause a runaway greenhouse effect. The orbital period there is 312 days, so the orbit has to be VERY Earth like for the planet to have stable water.

(There's a second-order effect that large planets with thick atmospheres have stronger greenhouse effects, so even at Earth's orbit distance, this Uranus-mass Uber-Earth might barely allow stable water.)