Can someone provide link to IHG properties having Club/Exec Lounge, post-Covid reopening?
Yes, historically, generally properties: IC and CP (Crowne Plaza) had/have lounges, I found a Voco, couple of posters mentioned a few HuaLuxes

How can decide if Lounge benefit of use, if don't know what properties have them?

Exec/Club Lounge concept has existed 20-30+ years. IHG in business 20+ years and
1. IHG website and IHG App both don't have a check-box "Exec Lounge" ..... Hilton , others have
2. IHG has no link on website or App to properties with Exec Lounge
3. IHG Rewards Dept and country/regional Guest Relations and IHG Diamond Elite: all have said there is no List (eg PDF)

What international hotels company has no clue about characteristics of its hotel Properties ??
One IC property told me previously they had an Exec Lounge, but did not meet IHG's criteria, so lounge was removed.

4. so, Rewards Dept or Global Chief Customer Officer ....run a database query on whatever this criteria is and send list OR post it on a website
... "can't do that"
Why not? if your Properties database has one or more criteria eg. Lounge "Yes/No" or more informative Lounge Operating Hours (days of weeks and Hours) this gives two+ pieces of info
... "i don't know"

Hmmmm ...again, Global Chief Customer Officer ...no response on this and list of features for App and Website , and Points Crediting processing slowness and errors

5. Just go to the Property and click ... of course, and searching a few countries (adjacent, several properties) for a single trip.
Firstly, this is rather one-time process Exec Lounge doesn't appear / disappear weekly or monthly.
Secondly, of course can look at individual Property by Property reading through descriptions, but how to decide for a Milestone ?? That's different than one particular trip
Thirdly, some descriptions say Exec/Club Lounge but then says May/May not be open because of Covid eg, in Portugal. ie, the property descriptions can be out of date .... so Property descriptions not even reliable?

6. Contacted properties (where could find an email address on website ...no consistency/ standard for this ...and/or by google searches) and Guest Relations ...summarized responses and replied all. 12 hours later, a Diamond Elite email responds with opposite info for 5 of 6 properties. so Diamond Elite rep(s) reliable ?

Hmmmm, what to think ?
IHG properties' people hard-working and property physical aspects are what they are. But IHG global IT ... !@#$% ...and seems Global Chief Customer office doesn't prioritize IT items and/or hire good programmers and/or hire or train Rewards/Diamond Reps product or properties knowledge.

IHG Spire/Diamond since initial year.
100+ nighter per year. Stopped staying at IHG in August at 139 nights. Time-wasters at IT and central & Corporate to resolve errors/make things simpler for members

FT good. But a global corporation should be doing such work and central/Corporate/IT lets down the hard-working teams at the properties.