What you friend appears to have received is information on the old scheme (i.e., 90% coverage up to a maximum of €20,000). The deposit protection limits were changed last year. Now 100% of the first €100,000 is covered by the Irish deposit protection scheme (note not all banks are necessarily included in this, for example NIB, Rabo and Investec are covered by foreign schemes - though they can top up their coverage to be in line with other banks operating here). Secondly, the governments bank guarantee scheme insures the liabilities of banks covered by the scheme (BOI is one of them)are guaranteed by the state up to end September next year.
So the first €100,000 is covered by the deposit protection scheme with the remaining be covered by the State for another 18 months.