Hello, and welcome! You are following a third-party guide last updated in 2016, and was intended for use with OpenBSD release 5.8. I'm not going to read through it.
Each architecture has a unique login class capability database, login.conf(5), and that database changes with OpenBSD developments. For amd64 and OpenBSD 7.6, the default class is defined with a fixed limit of 1.5GB for datasize -- that's virtual memory, not RAM -- while the staff class has no maximum, as datasize-max is set to infinity.
I recommend using the staff class for workstation users. Modern browsers need vast amounts of resource to function.
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