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Try adding a field separator after the publishing year:
awk '{sub (/[0-9][0-9][0-9][0-9]\.@: /, "&|"); $1=$1} 1' RS= FS="\n" OFS=\| file | sort -t"|" -k3,3r -k4,4 | awk '$1=$1' FS="|" OFS="\n"...

Like so?
awk '$1=$1' RS= FS="\n" OFS=\| file | sort -t"|" -k3,3 | awk '$1=$1' FS="|" OFS="\n" ORS="\n\n"