Yes the sounds are provided royalty free, sorry it's not clear! I'll modify the listing so this is clearer. The exact text in the download reads as:
*** Licence ***
1. Any purchased sound effect can be used or modified for use in any presentation whether free or commercial without royalty and without accreditation.
2. Example sounds may not be used or distributed.
3. Distribution of any sounds to any third party for use as sound effects is not permitted.
4. All sounds are orignal recordings from the sound source or created using synthesis from original samples or raw waveforms.
*** Credits ***
Recorded and/or synthesized by Mark Sheeky of IndieSFX under licence.