Applying the Solubility Guidelines is AgClO4 soluble or insoluble?
Different guidelines will say slightly different things to convey the same idea. Many I've seen don't explicitly mention silver, but still produce the same result for most compounds. I don't have that book but if it's anything like these, there's probably another line that says salts of anions like nitrate and chlorate are soluble. 

This table is worded a bit better to make the possibility of exceptions more explicit:


  
  Salts containing Group I elements are soluble ($\ce{Li+, Na+, K+, Cs+, Rb+}$). Exceptions to this rule are rare. Salts containing the ammonium
  ion ($\ce{NH4+}$) are also soluble.
  Salts containing nitrate ion ($\ce{NO3-}$) are generally soluble.
  Salts containing $\ce{Cl^-, Br^-, I^-}$ are generally soluble. Important exceptions to this rule are halide salts of $\ce{Ag^+, Pb^{2+}}$, and $\ce{(Hg2)^{2+}}$.
  Thus, $\ce{AgCl, PbBr2}$, and $\ce{Hg2Cl2}$ are all insoluble.
  Most silver salts are insoluble. $\ce{AgNO3}$ and $\ce{Ag(C2H3O2)}$ are common soluble salts of silver; virtually anything else is insoluble.
  Most sulfate salts are soluble. Important exceptions to this rule include $\ce{BaSO4, PbSO4, Ag2SO4}$ and $\ce{SrSO4}$ .
  Most hydroxide salts are only slightly soluble. Hydroxide salts of Group I elements are soluble. Hydroxide salts of Group II elements
  ($\ce{Ca, Sr,Ba}$) are slightly soluble. Hydroxide salts of transition
  metals and $\ce{Al^{3+}}$ are insoluble. Thus, $\ce{Fe(OH)3, Al(OH)3, Co(OH)2}$ are not
  soluble.
  Most sulfides of transition metals are highly insoluble. Thus, $\ce{CdS, FeS, ZnS, Ag2S}$ are all insoluble. Arsenic, antimony, bismuth, and lead
  sulfides are also insoluble.
  Carbonates are frequently insoluble. Group II carbonates ($\ce{Ca, Sr, Ba}$) are insoluble. Some other insoluble carbonates include $\ce{FeCO3}$
  and $\ce{PbCO3}$.
  Chromates are frequently insoluble. Examples: $\ce{PbCrO4, BaCrO4}$
  Phosphates are frequently insoluble. Examples: $\ce{Ca3(PO4)2, Ag3PO4}$
  Fluorides are frequently insoluble. Examples: $\ce{BaF2, MgF2 PbF2}$.