Basement Waterproofing a Basement that has Structural Clay Walls Using Weep Holes

So I'm on the verge of pursuing a basement drainage system which uses weep holes. It's basically your typical French drainage along each wall where it drops into a trench some perforated pipe at the footer's edge and on top of that is pea gravel followed by a drip board that encapsulates both the trench as well as about 4-6 inches worth of wall after weep holes have been drilled into the block. The bad thing about my basement is that it has a few walls that were built with what I understand as being "structural clay block," which have horizontal voids. I believe these have been "kiln fired" (see attached image and judge for yourself). The house is an older home, likely built back in the 20s or 30s and this unfinished basement was dug-out after the home was built, which is one reason these blocks might've been used. The contractor who will be doing the work seems confident that drilling into this kind of block is a simple issue and he didn't seem to expect any problems in doing it. I have 2 other walls that were recently built back in November with your common CMU block and I'm not worried about him drilling the holes into those, it's just these older clay blocks I'm worried about. My fear is that he (or his team) could either use the wrong bits or improper technique, whatever, and cause a confluence of failures forcing me to replace an entire wall. Is it worth the risk? My heart of hearts says "no," but I'm so tired of worrying about rainwater in my basement that I'm close to taking the gamble anyway. Thing is, my yard lacks necessary height to properly grade it, so there's no options with any landscaping beyond what I've already tried to do (add berm against house, etc.). I've already extended my downspouts 20+ feet out from the house with solid PVC pipe, which did help a little. The new CMU walls that were installed this past November are the only walls that have a real perimeter drain. This drain line is connected to one of my sump pumps (I have 2). The drain line itself sits on top of the footer (the contractors didn't put it at the edge, but the top of the drain pipe is below the bottom block of the new walls by at least a couple inches and it's a 4-inch corrugated-perforated black drain pipe that was used). The perimeter drain does work, both pumps pump like crazy during heavy rains, but I just get seepage along the cold / cove joints and corners where the new walls meet up with the old. Through discussions, I've been told that it can be dealt with using this interior drain system / weep hole approach, but drilling into those clay blocks keeps me up at night. Would love to know if you think it's doable... Thanks in advance.

source https://www.inspectorsjournal.com/topic/18931-basement-waterproofing-a-basement-that-has-structural-clay-walls-using-weep-holes/?do=findComment&comment=172758