IME here on the DIS, RD has not usually been recommended for SSE because it generally does get a line first thing in the morning as people are entering the park and passing beneath the sphere.
Also - as has already been covered - the roundtable discussion is generally the podcasters voicing their opinions. Perhaps, to that poster, the lines that currently exist for SSE do constitute a "line" necessary enough to use a FP for it. That determination is subjective to everyone.
To look at data, though - using Jan 26th as a date - here's the info from Touring Plans on SSE:
(#s are, in order: Average Wait Predicted, Average Wait Observed, Crowd Level Predicted, Crowd Level Observed)
2015: Spaceship Earth 19 23 4 6
2014: Spaceship Earth 10 12 4 6
2013: Spaceship Earth 9 9 4 4
In 2013, FP+ was not yet in place. So between 2013 and 2014, with the observed crowd level increasing by 2 and FP+ being at the resorts (but not yet for offsite, and with tiers being relatively new since Nov 2013), the average wait for SSE only changed by 3 minutes.
Between 2014 and 2015, with no change in crowd levels observed but FP+ now available to all WDW guests, the average observed wait time almost doubled (12 mins to 23 minutes).
There are many people on these boards who consider rides with 20+ min average waits as their threshold for "needing" a FP to ride it. Haunted Mansion, for example, also had a 20 min average wait yesterday. Many people consider that a "good" FP+ to get in MK. Mesaboy's thread rates HM as a "B" FP+ to get (#3 of the Bs, just behind Buzz and FOF). His thread also rates SSE as a "B" FP+ in Epcot.
My point, just in case it's gotten a bit lost in my rambling, is that a line that people consider "necessary" to get a FP+ is subjective by nature.
If you have a problem with the podcaster (which I only say given your previous post with specific times of things that were said that you disagree with), there's a thread on the DisUnplugged Podcast forum already talking about
corrections to that podcast. Some of the podcasters have responded. I'd recommend letting them know what your concerns/problems with the podcast are directly.