He highly suggestible character of Holzer’s use of words

1. What does "the highly suggestible character of Holzer’s use of words" mean?

2. Does "which" refer to "consumer advertising"?

3. Is "which" referring to "Saatchi’s Silk Cut campaign"?

Context:

In effect, the highly suggestible character of Holzer’s use of words and her deployment of terse forms, such as the cliché or the truism, emulates the shorthand route to the unconscious that is at the heart of consumer advertising, which, with its wider distribution and constant repetitions, also replicates the effects of loci communes sermonis. Moreover, in their reliance on the suggestibility of the viewer and shorthand methods of representation, Holzer’s texts can be seen as the inverse of the copy-free advertisements that are to be discussed in Chapter 3, such as Saatchi’s Silk Cut campaign (which is also traceable to Symbolism through the influence of that movement on
Surrealism).