The section "[Bill of Materials|https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#bill-of-materials-bom-poms]" explains that one should use some properties to define submodules versions (e.g., project1Version). Defining versions this way lead to publish pom files with $variable in in their <version>. This a bad practice that Maven warns about during builds. I think this should not be advocated in an introduction guide. AFAICT, the "standard" way for handling a bom setup is to have all modules inheriting their versions from the parent pom.
If one committer is willing to point me where the code of this guide is stored, I may be able to submit a patch.
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