Please compare the paragraph you quote with this excerpt from the supplementary information accompanying the final regulation:
...the final rule provides that a participant could notify all of its commercial customers that restricted transactions are prohibited through a term in the commercial customer agreement, a simple notice sent to the customer, or through some other method.
Whoever wrote your paragraph has added the language suggesting that publication on a web site might be compliant. That is an expression of a personal opinion for which there is no published support.
My personal opinion is that simply publishing the verbiage on a web site would not even be treated as an attempt at compliance.
Now, if you could conjure up a mechanism where commercial customers logging on would have to acknowledge receipt of the notice to clear their screens, track who had done so...
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.