Tor has made some improvements that would reduce the threat of deanonymizing an onion service, but none affect the above analysis (or rather, the above analysis has taken them into account). The main improvements, in my opinion, have been:
1. The biggest improvement is that (in 2014 or 2015?) they reduced the number of entry guards from 3 to 1 [0], reducing the risk of a malicious guard by a factor of 3.
2. The time until a guard choice expires was increased from 2–3 months to 3–4 [1] (this maybe happened 3 years ago?). This increases by ~40% the expected time an adversary would need to passively wait to have his relay selected as a guard by a victim.
3. The bandwidth threshold to become a guard relay was raised from 250KB/s to 2000KB/s [2] (looks like in 2014). However, 2000KB/s=16Mbit/s is still a very low bar, and, moreover, for an adversary that can run relays above the threshold, this change increases the adversarial guard fraction as there are fewer guards above the threshold to compete with.
4. A new guard-selection algorithm was implemented that prevents a denial-of-service attack from forcing a large number of guards (i.e. > 20) from being selected in a short period of time [3]. I believe this merged in 2017. If an adversary can force guard reselection by an attack, you are still extremely vulnerable, though, as a limit of 20 still provides a 20x risk multiple.
Its 2020 now so much has to have changed. Tor sucked 7 years ago.