In all of your ScyllaDB benchmarks, you've used m5 instance type family.
(e.g https://github.com/benchANT/database-ranking/blob/main/CRUD-general-purpose/2022/ranking_batch-0_scylladb-451-vanilla-os-large-large-awsec2-2022_0_1NkNG04T/dbms_data_hardware_facts.json)
ScyllaDB recommends to use "Storage Optimized" instance types (as you used in your blog Mongo vs Cassandra).
i3, i3en or the new i4i instances are much more suitable option to benchmark ScyllaDB with.