If so, what are some of the ways he tried to address those grievances?
This is not the same thing as me saying "that is good and I'm glad it happened", to be clear! Just ... if he didn't actually do what the parent post suggested, I don't see how that response is relevant.
Fast forward a few weeks, they started protesting in front of his condo building - shining lasers in the windows, trashing the lobby and shooting fireworks. The mayor said he will be moving out.
The main criticism is that it is not enough or not fast enough. The bigger frustration is the fear that current policy changes are only to appease and not to fix the root issues.
For example, Wheeler only recently banned the use of tear gas: https://www.portland.gov/wheeler/news/2020/9/10/mayor-wheele... (note the date--6 days ago).
Another example, funding cuts were not seen as enough: https://www.opb.org/news/article/portland-police-budget-15-m...
The most comprehensive list of demands, including updates to their status, can be seen here: https://www.reimagineoregon.org/policydemands
The small picture of these protests is that an unarmed black man died while handcuffed, on his stomach, pleading for his life, with a police officer's knee to the back of his neck.
The bigger picture is that systemic racism has been an ongoing issue for decades (but since the country's founding, actually). Oregon itself has quite the history with systemic racism: https://en.wikipedia.org/wiki/Racism_in_Oregon
So the frustration isn't necessarily that policies are subject to debate or that compromises have to be made; the frustration lies in elected officials that help maintain a level of systemic racism via inaction and non-enforcement. Hence, the particularly aggressive use of "demands" which is also framed around ongoing protests in Portland and elsewhere.
This, I think, is far more clear in the use of the phrase "defund the police." A lot of people have issue with this phrase because they think it means entirely eliminating the police force. And yes, some percentage of those who say "defund the police" do mean completely eliminating the police force, but the majority actually mean "divert significant funding from the police department to social programs and health workers." However, there are two issues with that; 1, it's not very succint. 2, it does not adequately express the frustration people have with police.