Relative abundance multiply total sequence counts equals read counts?

I saw an article from “nature comunication” said that relative abundance multiplied by total sequencing counts equals raw counts ?

Is this right?

Predicted read counts can be also retrieved by running the analysis with -t rel_ab_w_read_stats

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thx for @fbeghini help,
I noticed that this paper then use the read counts for humann, I find my metaphlan & humann results were both abundance files. If I want the readcount humann results, should I use the readcounts metaphlan feed to humann or any other method can transfer humann abundance files to readcount