The letter makes points that the trademark is already abandoned. I'm not familiar with trademark laws, but if the trademark is already abandoned, why the need for the letter?
One of those situations where the law can be on your side but the real problem is if you can afford the legal battle.
Some countries, the trademarks are market sector specific, but in other places cover all use cases for the name/mark.
It is highly recommended to trademark commercial products/names in each country of import. Otherwise your company could end up getting sued/imports-seized by an opportunistic a*hole that does nothing except sneak copyright/trademark rights.
Oracle is smart, and will sit on the IP like any business person should.
Most people that complain about trademarks/copyright have never been ripped off for a few hundred thousand by import/customs rules, or had counterfeit products show up for warranty repairs/returns.
IP is messy for sure, but it is better to negotiate from a position of legal power asymmetry when dealing with unreasonable individuals. Some people are crazy... had a few cons harassing one of the engineers a long time back, and needed legal to politely "ask" them to find another hobby. =3
That's why we need to file a petition with the US Patent and Trademark office.